questions about buying parts for a yz400f or 426 head

are these heads the same core and do all parts interchange?

i have been studying up flee-bay watching guides valves springs and retainers and keepers but the years the suplyrs say their products will fit is bafling me

i know stanles steel valves take heavyer springs and that posibly the 2000 426 came stock with steel valves but what do i really need to know before i order to redo a head?

i,ve seen stock yamie valves are going kinda cheep but will they all work well in eather a 400 or 426 head ?are their any differences i should know about?

any real difference performance wise between them?

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