Are Valves of US & Japan made F23A1 engine intercheable?

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 parts lists recommends different (and much more expensive) intake and exhaust valves for the Japan made engine than the US made engine.
00514711-P0A-000VALVE, IN. (TMSS Japan made) $18.51:
00514711-P0H-A00VALVE, IN. (U.S. ENGINE VALVE) $10.45:
00614721-P0A-000VALVE, EX. (TMSS Japan made) $ 28.74
00614721-P0H-A00VALVE, EX. (U.S. ENGINE VALVE) $15.33

Dokuro, a Japanese manufacturer of valves, also lists different parts for the Japanese and US made engines.

But Beck Arnley and Federal Mogul lists the same valves for both US and Japan made engines.
My question:
1) Are the valves for the US and Japan made engines interchangeable? If not, what are the differences between those parts?
2) Has anyone installed valves for the US engine in a Japan made engine and encountered any problems.
Your advice would be appreciated.