sorry i cant quite understand...
Do you mean can you change the position of where the rear turbo housing sits on the manifold?
So it bolts up to the dump pipe in the same spot?
If thats the case then the answer is that the turbo can only hang where the manifold will alow it to.If you were to get an evo manifold it would change it again,but im pretty sure an evo manifold wont go on to a 4G93.
You'd have to modify the dump pipe where it meets the turbo,a good exhaust shop wouldnt charge much to do this..
On the other hand if you unbolt the V-clamp on both turbos and swap the rear housings, you could put your TD04 rear housing on the TD05 turbo..That i would imagine would put the rear housing in the same spot as your TDO4..but it would be a downgrade on performance.
Heres a link for removing the rear housing...
This particular article talks about doing it on the car.
Read from where it says BAND CLAMP.
http://www.vfaq.com/mods/turbine.html