Here are 5 Sessions played by eXtreme Gammon version 1 (200 games each) and analyzed very deeply (most moves have been rollout out).
The data is displayed using outplay. This is a good way to compare the 2 version. The moves showing has outplays are the one XG1 outperformed XG2.
For instance, in the 1st game. XG1 outplays XG2 80 times, but XG2 does better 137 times. Overall on that 1st session XG2 is 0.45 PR better than XG1.