I was looking at getting another case of PPU M193 and I see there is some in the small square boxes like I've always got and some in the thin rectangular boxes like most other ammo comes in. It's both listed as M193, only other difference I can see is the stuff in the square boxes comes in the sealed battle packs and the other doesn't. Is it the same stuff other than the packaging?

ETA. the stuff in the sealed packs is about $20 higher.

Military vs Commercial packaging. Same ammo.