ok, so i looked at My copy of nistune in relation to r34 ecu's as I was curious.
There are approx 6 different image files, and this is the biggst difference i could find quickly comparing them. Alot were identical.
The timing maps had a copule of spots with 1 or 2 degrees different, wouldnt matter at all.
this snip is comparing 2 fuel maps.
i would call them the same....
you can download nistune as a trial, load them up into the main and comp slot, then click the magnifying glass to compare.