yes and the above is inaccurate.
you can fit an erst t3, cossie 2wd t3 and a cossie 4wd t3.
you can just unbolt the erst core from the turbo housing, 6 bolts, probably really stiff and change cores over.
however you'll find ideally you'll need a bigger exhaust housing, i'd go for a 0.48 one, have a search for one, won't cost much, maybe £10-30.
then you don't need to alter anything else, just maybe the actuator bracket and spin compressor housing by loosening the bolts spinning and tightening the bolts again.
but if you wish to get less restriction on the tubo, get a cossie turbo with 0.48 housing and modify a cossie down pipe.
i've done all the above at som epoint and now settled with a cossie housing and down pipe on a 4wd turbo as this is the biggest power one.