Hi Steph,
The Grant CDL was first used in NWE during the Rhine Crossing. 24 were brought back into service and issued to B Squadron 49 APC Regt. Originally there were 3 CDL Regiments that landed in Normandy in August 44. Of those brought back into service, 12 were deployed in a diversionary fire support role and 12 at the actual crossing points. The Remainder having been're-tired' in October 44 as it was felt there would be no use for them and the crews were needed else where.
Hence the similar markings.

Cheers
Al