I'm looking at ebay for second hand mini 2s and some of the listings have an SL number on the end (I've seen SL20, SL35, SL12, SL14 and more). Does anyone know what this is and does it make any difference to the spec or what's included?

Perhaps if you gave an example to show the context, it might make some sense?

Hello there AirSnaps. Good day and thank you for the inquiry. Kindly please post a screenshot sample of the serial number for us to be able to check. Thank you.