Questions about upgrading 99 OS to Custom 2001 OS

Alright, I just got flashscan so bear with me.. lol

I"ve read the tutorials and searched.. etc.. but i've got a couple of questions.

To run the 01 OS in my car, first I do a full reflash to EFIlive OS 01250001.. then I reflash the calibrations for GM OS 12202088 correct?

So, now I should have a stock 01 OS for a LS1 T56 Firebird.

Here are a couple of questions:

How will the difference in fuel and timing affect my car? I noticed the Main VE in my 99 OS have larger values than the 01 OS, is this because they did away with the backup VE table? Should I copy and paste the values over from the main VE in the 99 OS to the 01 OS?

Same thing with timing.. I noticed my 99 OS has more timing as well (high octane table) should I just leave the 01 values the same until I start tuning or paste the other values over?

I"m sure there are more things that are different but I just noticed these at a glance.

Any feedback would be great.. I wanna switch this thing over so I can really start tuning on it.. starting with idle and autotune.

PS, also.. is there a difference between running the 01 OS vs. the 02 OS?

Thanks!

Chris