Yeah, a few of the same people worked for Asder and Rex I think. they do seem to have used the same sound engine and fonts at times anyway. (although the font is stolen from somewhere, I forget where). I guess that Rex game using the Huang-1 chip was published by Ge De or whoever..which one was it?
I'm not 100% convinced by this Asder->Someri thing, but I guess there could be something there... the only character thats completely identical is the ©, but the others do look kinda similar.