a) Ask your boss to get the FCOM for that particular MSN.
b) Print out and compare the ENG sections of DSC & ABN.
c) Done. Do not worry about missing something, the relevant stuff is up there in vilas' post.
You will need to append OM-D with the familiarization training and pilot knowledge review. The comparison from B) should be enough, embedded into your company's standard PowerPoint templates.
Pilots who did not fly the IAE before will have something to talk about and keep themselves occupied for about a year. Carefully collect their experiences and griefs to fortify those briefing notes.
i) there's something called N1 mode. The first one to use it will be completely perplexed.
ii) flying unreliable airspeed with N1 tables is busy work, the doughnuts are sorely missing.
iii) there are different limits on starter engagement/cycles. Also what is and what is not a cycle is different. Don't let your guys paint themselves into a corner or do something very costly.
iv) cross wind take-off procedure is slightly different
v) ice shedding is required after 3 mins IIRC, which is a real pain.
vi) you will love SETI with these.
vii) the oil quantities before flight are different, QT/h.
viii) it is very conducive to overthink (a different) flare and landing technique. More often than not it is the mind playing the bad tricks, not the engines' residual thrust (or lack of)
For WRIGHT BROTHERS SAKE - make sure EVERYONE knows how to spot an open cowling!!! (no, you definitely do not need to crawl for that).