914 front rotors and interchangebility with VW

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The question is regarding the interchangebility of the 914-4 front rotor on a VW Karman Ghia's. Are they the same part? Visually they look very similar, but I don't have a 914 part infront of me to fully measure it up. I know there are two types of 914-4 front rotor, the 72 and earlier, and the 73 and later. Are any of these interchageble with the VW units. The reason I ask is that I have access to the 914 rotors and want to know if they will fit on a Ghia. (I'm just replacing the rotors on the ghia).

Any help is greatly appreciated.