Short answer: No
Traditionally medium is numerically a 40, Large is 44 etc.. The current Nike NBA system doesn't adhere to this. They equate the wrong numbers to their alpha sizing.
If you are a Medium, go with M&N 40 or Nike 44.
If you are a Large, go with M&N 44 or Nike 48.
Those patches are well made replicas. They are not authentic team issued and will have some minor differences. It's gotten messy because shady resellers just call them authentic and it's just proliferated.
Was it directly From NBA Store or the Celtics pro shop?
Almost all the ones on Ebay are aftermarket. Bunch of collectors started adding them and calling them "authentic", and the misinformation just proliferated.
Link on the authentic Finals Brunson? Just want to see it for myself :emoji_eyes:
I wonder if they used the legit rubber versions or the retail embroidered ones though...