That information is classified but you could go through the tyre label of both and check load rating etc to see all relevant specifications match, however I have never heard of insurers requiring use of MO tyres therefore it is acceptable to use non-MO if tyre manufacturer approves use for your make and model though it is not recommended to mix MO and non-MO in same car!
MO means the tyre is approved by Mercedes for new vehicles, therefore the tyre will be Original Equipment. Mercedes MAY OR MAY NOT have changed the tyre slightly to their own specification, though changes are more likely for performance tyres I understand.
As tyres keep evolving I guess it may actually be better to use non-MO, the older the car! I hope to get the latest (presumably not MO'd for EQC) new-gen Scorpions next time as they are supposed to be much quieter, better braking etc:
press.pirelli.com
MO means the tyre is approved by Mercedes for new vehicles, therefore the tyre will be Original Equipment. Mercedes MAY OR MAY NOT have changed the tyre slightly to their own specification, though changes are more likely for performance tyres I understand.
As tyres keep evolving I guess it may actually be better to use non-MO, the older the car! I hope to get the latest (presumably not MO'd for EQC) new-gen Scorpions next time as they are supposed to be much quieter, better braking etc:

PIRELLI PRESENTS A RENEWED RANGE OF SCORPION TYRES: SUMMER, ALL SEASON AND WINTER TYRES DESIGNED TO HIGHLIGHT THE CAPABILITIES OF SUVs
LOW FUEL OR ENERGY CONSUMPTION, HIGH MILEAGE AND EXCELLENT BRAKING PERFORMANCE THANKS TO THE NEW REINFORCED TREAD, CERTIFIED BY GERMAN TÜV SÜDTHE SCORPION FAMILY HAS THE MOST ‘ELECT’ HOMOLOGATIONS FOR ELECTRIC OR HYBRID PLUG-IN CARSMilan, 16 February 2022 – Pirelli has unveiled the new Scorpion...