yes a product that is marked meets or exceeds the rating of .... will be at the very least able to take the shot from that rating... if it's 87.1 it's not enough, imo. but it can very well be thick enough or strong enough to handle 10J... they just didn't test that said product or paid for it to be tested. which is why they say meets or exceeds.
Frankly if they say say meets or exceeds 87.1 I would go look for nicer. Lowest common denominator is not something worth gambling your eyesight on.
Friend of mine had clone glasses (rated 87.1 or better) deform and touch his eye lid when his glasses took a shot. Granted my friend is a bit more bug eyed than some so it's possible the whole frame just shifted into his protruding eyes, but why take that risk? He went out and ordered milspec stuff in the off season.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.