From memory, Brown's Camel's colour scheme was added to, over it's service career. I think the WNW scheme shows as it was on the fateful 21st April, but the Academy and Revell markings show it as it was later - perhaps 'enhanced' for the publicity earned after the MvR kill was officially registered?
So they are probably all OK! (but I haven't checked if my memory is playing me true!)
Sandy