Apple Airpods' Manufacturer's Part Number (MPN)

Hello there!

Hope everything's is good with y'all. I have got one simple and stupid question out here.

I've searched the whole Internet to find out "what is the difference between Apple Airpods' MPN" (Manufacturer's Part Number). I mean, I saw some models having a "MMEF2", others have "MMEF2AM/A", saw the "MD827LL/A". Could some of you please let me know, what is the real difference between those numbers. Are there any functional differences of is it just a regional MPN, or may be something else.

I would really appreciate any kind of information being provided here 🙂

Thanks in advance and may the force be with you.

Best Regards,

kespeee