Then that is fair Mega. All gyms are different. I'm not trying to call you or anyone else out, I'm just saying to those that are unsure and have not talked to their coach, they should do that before buying gloves of a smaller size than 16oz to spar with. If your coach has told you this and you're fine with it, your partners are aware of it, etc...then that's great. Go for it. Like others have mentioned, 14oz winning is much better than and 18oz walmart everlast in sparring. So the branding, not necessarily the size is important in that case. Good on you for talking to your coach. I'm assuming both sparring partners will wear the same size when you said your coach allows sparring in different sizes? Would be kind of weird to see a 14oz vs a 16 or 18oz in there lol.
Also cobe that probably was me or shihtzu... I posted the video where floyd shows all his gloves and talks about winning being the best. He has a variety of sizes. Two weeks ago he was hitting the heavy bag with 16s. He also hitts the mitts with 10's, 12's, 14's, 16's depending on how he feels. He switches it up my friend.