Best to check with Mamiya. I own and use the C330f extensively and have several reference books available. None of these expressly state that the viewfinders are compatable, but there is every indication that there is only one type for all the C-series. I advise further check even though a viewfinder should be cheap.
I love the smell of fixer in the morning. It smells like...creativity!
Truly, dr bob.
Hmm. I thought it was explicit that the finders are all interchangable. Section 6.4, second paragraph. All the Mamiya finders will fit all cameras from the Mamiyaflex to the C330f. There should be no problems with the BaierFoto Kiev prisms either.