Marin Bear Valley SE - Frame and fork sizes

CJND

Retro Newbie
I am restoring my 1994 Marin Bear Valley SE. I believe it has a 19" frame (C to C - centre of bottom bracket to where seat tube meets top tube - is that correct?)
I need a replacement Marin rigid fork and headset. Must this be from a 19" frame or could it come from a 17.5" Bear Valley frame bike?
I am looking at a donor bike on Sunday.
 
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