But not all SVR’s have this wing, correct?

One I am looking at certainly doesn’t.

 

Don't quote me but my understanding is that the large wing in the pic tilts up a little at speed (dunno what speed) then comes down again when the speed drops, much the same as the "normal" deployable wing on cooking F-Types does at 70 mph (up) and 50 mph (down).
And that on a SVR with the large wing only the wing itself tilts and the otherwise deployable spoiler it is mounted to does not move at all.
Edit - looking at the pic and knowing how far the "ordinary" wing rises there is no doubt that if the base of the large wing also rose like the ordinary wing the tips of the large wing would foul on the tops of the rear fenders.

 

Right. And that not every SVR has the large fixed wing as in the pic. Some have the same rising (deployable) spoiler that the R version has.

What I was wondering is if a large fixed version wing can be fitted on an SVR that came with the R type deployable version.

 

Little doubt it could be added but I'm betting it would be fairly expensive. Not just the cost of the new wing but probably some other hardware is needed as well, and maybe some re-programming too. And like most SVR parts you probably can't get it without quoting an SVR VIN.
There are some posts and threads around here somewhere about replacing the stock deployable wing with the "sports" fixed wing (not the SVR wing) and that needs a whole kit with a number of new parts.

 

i was going to do the svr trade a while ago, had a long term test drive and i wasn't really left thinking there was much difference, other than the newer nav screen - i'm also not a fan of the silver faux alu plastic trim in the later cars, but that's nit picking

biggest issue for me was the awd, the svr def accelerated faster off the line but i'd attribute that more to the awd than +25hp, but i didn't like how planted it was. the R in rwd moves around a lot in the rear and in an era of forced awd hybrids/ev's on horizon, it's a quickly diminishing platform

if you're comparing awd R to awd SVR, as i realise you guys in US only got the rwd for a short amount of time, i'd prob go the SVR just for the ego of it honestly

 

That's what grabbed me, then after coming to this site I discovered the low build numbers of the SVR which adds to the exclusivity of the interior, body panels, and exhaust.