Why were there three different IFR tables {B4001} for the LS1 V8's that were made after 2001?
In fact counting the 2001/2 Camaro there would be four.

All of these engines were fitted with both the LS6 intake manifold and the LS6 28lb injectors, so were mechanically much the same.

What effect would this have on the VE table and maf sensor frequency?

By 2005 Holden switched to using the same IFR table that GM had been using all along since 2001 (in fact the 2005 and 2006 Holden factory tunes as a whole, had much more in common with the earlier GM tunes).

Yet VE tables were still different and in spite of using the same 85mm maf-sensor in all 2005-on LS1 production, there were still differences in the maf-cal.

Not so much an exact science, then? ....An example of more than one way to get the same result?