I was looking at Accurate Armour's Cromwell Mk 1 ARV, which was modelled on the vehicle used to tow a captured PZkfw IV during WW2. Was this same vehicle type also used in the Korean War?

Cromwell ARV was not used in Korea .Churchill ARV mk2 was used initially but it was replaced by Centurion ARV mk 1. cromwell variants used in Korea were Cromwell mk 7 gun tank & mk7op tanks also Centaur dozer was used.