There is one extra sprue (F) in the M2A2 ODS kit. Do not use most of the parts on the lower half of it. They are the ODS parts. You can use the spare road wheels and water cans. You can also use most of the gear on the upper part of sprue F, with the exception of the sleeping bags. The figures are wearing gear that is newer as well, so they are also out.
Also, add the front swim barrier part back as well.
The other thing you need is the older, triangle block tracks. Unfortunately, the metal and plastic replacement sets of these won’t fit the Tamiya sprockets since they have the wrong count of teeth (10 as opposed to the proper 11). I have a couple sets of Tamiya rubber band triangle block track if you want them, just let me know.
The instructions for the M2A2 kit are here, scroll down.
Also, if you want to add a bit more detail, the partial interior from the original Tamiya M2 (or Academy’s copy) is correct for an Desert Storm M2A2 as well.
This may help too: M2/M3 Bradley Reference Archive