It's just the way the system worked. The radiators were part of the 'power egg' and not part of the airframe. Focke-Wulf built the Fw 190 Ds and the Ta 152 Cs and Jumo and Daimler Benz supplied the respective engines and accessories. Even the engine cowlings were supplied by the engine manufacturer, only the gun cowl (klappe vor windshutz) was installed and painted as part of the fuselage assembly by Focke-Wulf, which is why they differ from factory to factory.
There is a good photo of two partly assembled Ta 152 Hs taken (surprisingly) at Kassel. The complete and painted Jumo 213 sub assemblies have been attached to fuselages still in natural metal and completely unpainted.
It would be surprising if the radiators were the same, not that they are different.
Cheers
Steve