Are the Valves of the US and Japan made F23A1 engine interchangeable?

The F 23A1 engine installed in the 1998-2002 Accord LX, EX and SE models was manufactured in both Japan and the US. The heads, valve guides and valve keepers were identical. However, the Honda lists different (and much more expensive) intake and exhaust valves for the Japan made engine than the US m

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