The difference between the OEM and full is the license rights associated to it. For OEM, the license is technically tied to the PC. Essential the same as if you bought a pre-built PC from Dell or HP......Not true with windows 10 , it's tied to your Microsoft Account and can be transferred to a new setup , but only 1 computer at a time can be activated with it.
If it's an OEM from a prebuilt it's not transferrable , but if it's purchased for a homebuilt it is.