IPad Pro MPN Differences

[BillHicksRIP]

Hi. I'm looking to buy a 2nd-hand Ipad Pro 12.9" 128GB. The listings I've seen show 2 different MPN (which I'm assuming is manufacturer's part number).

ml0r2b/a
ml0n2b/a

Does anyone know what the differences are or is it just the colour that makes the MPN different?

 

[welshdragon]

could one be WiFi and the other WiFi + Cellular?

 

[Kainz]

Google the part numbers. It seems to be just colour.