Are both charts the same? All the ones I can remember looking at have T/O figures drawn up for packs off, and G/A for packs on. After applying the corrections, and assuming you are operating at above ISA conditions (to eliminate any throw on from a derate) the figures I have come up with G/A EPR higher. This is on an A330 so is there any possibility that FADEC makes the numbers do different things?
(Sorry to original poster, not trying to hi-jack the post, but am quite curious now)