Yes you can replace any 1zzfe powed cars with a 2zzge but as for the izzfe, it cannot have a G head.
Depends on Engine... 1zzfe Step 1 = 36 (49) Step 2 = additional 90 2zzge Step 1= 26(35) Step 2= additional 90
No, It will cost you $$$ to swap that it. The b16 is from Honda. You can go 4age 20v Blacktop, 4agze, 4age Slivertop, 4efte, 3sgte, 2zzge, or 1zzfe with supercharger. Those all depends where you live, emission wise.
If you are comparing a 2zzge and a 1zzge it will be a direct fit. Exhaust components should still bolt up though.