These questions get asked alot. Its best to use tcu that came from m113k car due to different torque ouput and only just change coding string with winols/vediamo/Mb gear tool to match scn for the car and gear ratio. It can be sent to us and the correct firmware flashed into tcu and coded for your swap.
If you swap a V8 into a V6 car that uses the Small 722.6 5G transmission is NOT reccomended due to very low torque capacity of small 722.6 transmission. Not to mention if you carry over the v8 coded tcu it will not work as small nag has different planetary gear ratio that would need to be edited and just a coding change does not carry over that information in firmware.