So I'm loading a new rom into my car (still the same ROMID), and I need to copy all the data from my old rom obviously (timing, etc.).

So my question is for the stuff that's in hex, if I select it and do the copy+paste thing, will it copy correctly or will I have to manual enter everything and start it with the 0x thing?

 

It will work fine. ECUFlash copies the actual value, no matter what base.

Did you try to do it? (cause it works)