Please refer to this at first:
http://pcenginefx.com/main/nec_compatibility_guide.htmlAs I understand it, you can only use a Converter to play PCEngine HuCards on a US System. In order to play US HuCards on a PCEngine/SuperGrafx, you will need to mod your system.
Also note that CD games are generally cross-compatible if you have the proper system card (or above). Very few PCE SuperCD games/demo disks are not compatible with the US SuperCD card due to faulty version checking. In order to get those games to work on a US System you will need to get a Japanese System Card (and a HuCard Converter.) [I just used an Arcade Card Pro with my TurboDuo, now I have a modded SuperGrafx + CD.]
Altered Beast CD requires the V1.0 system card in order to be playable past the first level. (Still need to track one of these out.)