DDR3 RAM for sale in Japan as of today

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Wrong.

Different voltage, different singnaling etc.

I seem to recall hearing that the original spec for DDR3 recommended by jedec had the same signaling as DDR2 until Intel requested otherwise...

AMD is kind of suing intel over it...

as is though, it's also possible for memory controllers with DDR3 support to host DDR2 modules(not simultaneously though)

and come on 1.5V to 1.8V it's not like it's going to fry the RAM if a switch happened... it's like Running DDR2 @2.15V or DDR1 @ 3.1V it's not good for it but it's not like it's instant death. A lot fo peopel here run in excess of those value 24/7 without issue.(also heat is less of an issue with DDR3 so ehh)