Quick question for the LSx tuning guru's...

I have a customer who wants to put an Allison behind an LQ4. What im planning on doing is one of two things:

1) Modify a factory 8.1/Allison harness to work with the LQ4 engine.
2) Modify a factory 6.0 harness to integrate the Allison wiring into it. <--- most likely option

Since an Allison/8.1 was a factory option, it will obviously all "work". I just have to re-tune the 8.1 calibration/ECM to be happy running an LQ4. Its just going to be stock, no crazy performance mods, etc. Am I stupid for thinking that I can just copy-pasta 6.0 LQ4 tables into an 8.1 tune and be good to go?

Does anyone know what the differences are (if any) with an LQ4 throttle body/TAC module and an 8.1 throttle body/TAC module?? I know the 01-02 stuff is different than 03-05 stuff, and then in 06-07 I think the TAC module and pedal changed. So Ill probably just use 03-05 stuff...

Thoughts/ideas?

Thanks
Ben