I bought a number of Butler Creek 25 round 10/22 mags in 1993. Butler creek appears to have not changed the packaging or mag design since then as they look the damn same to me. They have no date code that I can find. Unless there is a secret that I don't know about, I'd say they are the same. However I'm not an expert and don't count on the "I checked with REP308" defense" if you get into trouble.
hint, hint, .......