Normally i can be found on 205drivers and 106owners, but my latest project brought me over here on 406oc

Im currently rebuilding a XU10 RGX, 2.0 turbo from a 406, to go into my 205 GTi. With programmable ecu, 440 injectors, IC ect...
Aiming for around 250 bhp, and to do that, i need one of those you call "Hybrid turbo" where i use the original turbo, with a different "cold-air" wheel on.
Did my research, but couldn't find the whole answer for my question.
The original turbo, is a T25/T28 aka. GT25/GT28 core right? Does that mean, i can fit any trim, which original matches this turbo core?
I found, that most of you refer to the Nissan sx200 / silvia turbo, like this:
Buuut... This "cold-air" side, does not fit the original boost pipes and ect.
So, is there any reason, that this cold-air side, does not fit? Its a GT28, trim 60. also
Does this fit?
Does any GT25/GT28 parts, fitt the original 2.0 turbo core?
Actually, i could use the new core, and replace the old one? (In fact, just changing to the original exhaust side, and put the turbo on the picture on the engine)
Thanks for reading/answering =)
BTW. Hope its understandable, Anton, Denmark