Both are different. SOME of the Revell kits come with parts to make both the M2A2 and M3A2. I've bought three and one does not come with the M3A2 TOW loading hatch or the ramp firing port blank offs. It makes a post-Desert Storm/pre-OEF Bradley. No stowage included, link and length tracks. I do not know why some Revell kits come with the extra parts and others do not. No differences in the package, just an extra sub-sprue and the directions are different.
The Dragon is an M2A2ODS (Operation Desert Storm) that includes the modifications added to the vehicle as a result of lessons learned during Desert Storm. It is not quite proper for a Desert Storm era kit, but backdating would be relatively easy.
The Dragon kit contains Combat Identification Panels (CIPs), an ODS TOW hatch and non-ODS TOW hatch (no M3A2 hatch though), and it has both the older and newer fluted 25mm barrel. A small gray vinyl sprue includes some duffle bags, sleeping mats, covered MOLLE rucks and a camo net. Tracks are vinyl and the wheels have poly caps inside.
Dragon one was cheaper by about $2 and builds into a more up-to-date version, but as a model, I think the Revell kit is better.
Rob Gronovius Modern US armor at