Mismatching base image to ECU number

[KidNeko]

Hi guys!

New to the NIStune scene, so forgive me for getting overly curious

I'm in process of tuning up my R34 GTT and a mixture of circumstances has led me to wondering; how exact must the base images on the daughterboard match with the ECU number?

I understand that running late version images on an early version ECU shouldn't be a problem (eg. AA560 image on an AA501 ECU)

But will there be any adverse affects if I run an MT image (AA560) on an AT ECU (AA570)?

Or in a more extreme case, run a Stagea RB25det NEO image on an ER34 ECU?

[Matt]

There are no issues (with NEO) ECUs swapping base images. You can also use MT images on AT ECUs, and WC34 (stagea) images on R34 ECUs

One note is some other ECUs might have slight differences (we know that SR20DE AT ECUs have some strange idle or RPM cut issues with MT base images)