well as far as the body is concerned they are identical
the engines is just the obvious... compression is higher on the 7mge, different pistons, auto trannies i would assume are the same but manual trans diff, 7mge has w58 whereas 7mgte has r154
gear ratios also differ i would think but i haven't really investigated it too much
7mgte swap has been done plenty
ecu, engine harness and engine... theres some links floating around on here for the 7mgte swap just do a search