The XKR has a different rack to the XKR-S which has a different rack to the XKR GT. The one in the GT is indeed the same as the one in the F Type fitted up until the 2016 MY.

This is from the press release for the XKR-S:

The structural integrity of the lightweight aluminium platform allowed the suspension to be reworked using bespoke components
for increased stiffness without a commensurate loss in either refinement or Jaguar’s legendary ride comfort. A reworked aluminium
front suspension knuckle and revised rear geometry are allied to stiffer springs and dampers, lightweight forged alloy wheels and
recalibrated steering effort to minimise any response delays and produce a more connected and agile driving experience.

The double wishbone front suspension has been comprehensively revised with a new aluminium steering knuckle that significantly
increases camber and castor stiffness by 0.13 degrees per Kilonewton to transform the accuracy and weighting of the steering for
greater levels of connection, feedback and precision. The Active Differential Control has been reprogrammed to reduce steering
sensitivity at the very high speeds of which the car is capable, increasing stability and driver control.

Rear suspension geometry has been revised with rear wheel steer optimised for maximum agility while spring rates have been
increased at both ends of the car by 28 per cent. Bespoke software for Jaguar’s Adaptive Damping has been written for the XKR-S,
ensuring both total body control and maximum traction and grip.

The Dynamic Stability Control System has been reworked to maximise the benefit of these wider tyres. In Trac DSC mode this
utilises specific traction, stability and eDiff settings to alter slip thresholds, differential torque distribution and intervention levels to
allow the experienced driver to explore the outer edges of the performance and handling envelope.


This is from the press release for the Dynamic R:

Dynamic R – based on the existing XKR – offers Black Dynamic Pack, which incorporates XKR-S suspension and dynamics
and a 10mm reduction in ride height, plus Speed Pack, which equips the car with an Aerodynamic Pack and an increased top speed
of 174mph. A Performance Active Exhaust is also standard equipment.

The double wishbone front suspension on both cars features a fully-machined steering knuckle which significantly increases camber
and castor stiffness by 0.13 degrees per kilo newton, to transform the accuracy and weighting of the steering for greater levels of
connection, feedback and precision. Rear suspension geometry benefits from rear wheel steer - optimised for maximum agility.

The XK Dynamic R features as standard the Black Dynamic Pack – incorporating suspension technology from the XKR-S –
which adds a stiffer knuckle for improved steering precision and uprated spring and damper settings.


This is from the press release for the GT:

New suspension and steering includes a wider front track, increased camber, revised bushings and faster steering ratio,
all developed using learning gained from Jaguar’s new F-TYPE two-seater sports car.
Height-adjustable and bespoke adaptive dampers feature a race-derived twin spring system.

Allied to the extensive aerodynamic revisions are detailed suspension changes. The front and
rear suspension arms, uprights, wheel bearings, bushings and rear subframe are all new and
draw on hardware developed for the f-Type. The overall set-up works to increase lateral suspension
stiffness for greater precision and responsiveness.

integral to the revised suspension system is its new spring and damper module design.
The XKR-S GT has a motorsport-derived twin spring system mated to Jaguar’s adaptive
dynamics damping system – the dampers now being ride-height adjustable. front and rear
spring rates are respectively 68% and 25% stiffer than on the XKR-S, while the damper
tune is much more track-focused, providing increased levels of body control and grip.
Jaguar’s adaptive dynamics have been specifically tuned for the XKR-S GT so that the
suspension parameters change to deliver a higher level of body control with maximum traction and
grip when the dynamic mode is deployed, offering optimum performance for focused track driving.

The XKR-S GT has a front track which is 52mm wider than that of the XKR-S while the rear
remains the same. The steering rack is from the f-Type, with a correspondingly faster ratio and
retuned steering valve. The result is immediacy of turn-in and response to steering inputs.

There are obviously a lot more differences but these are the steering and suspension related ones.

 

that gotta be a body kit cause that style bumper for XKR-S didn't come out for the 07-11 models if i'm not mistaken

 

well i missed where he said that. i thought he simply said uprated steering and suspension, which the thread does confirm. think you were maybe a little uncharitable on him there.

i am interested to know specifically why, though, and u102768's post here has what we're looking for. each one has got bespoke steering components to suit the uprated suspension it comes with! so it's actually done right, each time, even though it takes more work. were the question "what's the difference between my dynamic R and an XKRS?" then it does sound like the answer should be "not much, really." but on the other hand there does seem to be a significant difference from the XKR to the XKR-S GT.

 

Well... marketing makes magic. But when you go through a catalogue of parts - not that much difference.