Replace 4 speed tranny of 2.0 engine with 4AT of 1.6 or 5AT of 2.0

[LOLZ]

Nagloloko tranny ng 05 Mazda 3 2.0R ko and as per mechanic need to change the tranny.

Ang problema wala makuha na same type ng tranny. Ang available lang ay 4 speed tranny from the 1.6 model or 5 speed tranny from I think 06 and up model.

Ok lang daw ikabit either tranny kasi gagamitin prin daw yung orig bell casing ng tranny ko.

Ang concern ko lang wala ba magiging problema sa gear ratio or programming logic ng shifting, etc?

Salamat po sa makakapagbigay ng insights

If wikipedia and protegefaq site is accurate then it is likely the 4AT transmission for the 1.6 has the same ratios but a shorter final drive(they made a variation with different ratios but it is purportedly paired with the 1.5 engine or found in 2014+ vehicles). There is also the possibility that mazda PH used the same 4AT transmission(or atleast final drive ratio) for both 1.6/2.0 vehicles.

Protege© FAQ - Transmission Info
[FN4A-EL] 4AT Ratios
1st gear
2.816:1
2nd gear
1.497:1
1.553:1 (*1.5 specific)
3rd gear
1.000:1
4th gear
0.725:1
0.695:1(*1.5 specific)
Reverse
2.648:1
Final drive
3.683:1
3.904:1
4.147:1
4.416:1

4AT Final Drive Ratios for the 1.6(ZM-xE/Z6-xE)
4.147:1
4.416:1
3.904:1


4AT Final Drive Ratios for the 2.0(LF-xE)
4.147:1
3.683:1

[FS5A-EL] 5AT Ratios
1st gear 3.620:1
2nd gear 1.925:1
3rd gear 1.285:1
4th gear 0.933:1
5th gear 0.692:1
Reverse 3.405:1
Final Drive
3.863:1
3.458:1
3.652:1 (*2.5 specific)

5AT Final Drive Ratios for the 2.0(LF-xE)
3.863:1
3.458:1