i am a little confused.

i have a bunch of tmax 100 4x5 film that expired about a year ago if not a little more than that, and i was just about to process a bunch of it ...
but now i am not sure how i can find out if it is the new tmax 100 or the olde tmax 100. i never paid too much attention that that sort of thing when i bought it, i needed tmax 100 so i bought a bunch of it

the developing times in xtol are pretty different ... can anyone give me an idea if the box is different &C ?

i'd rather not have bullet-proof negatives, if i don't have to

much thanks!