The PAL version of Firehawk is supposedly different than the US one - according to one source, it doesn't have the Codemasters and Camerica logos on the title screen. Also, you said that there were 2 versions of Toobin', one the original published by Tengen, and a release for the Daou Supercom. However, there's also a seemingly undumped HES Australian version not mentioned (although it could still be identical to the Tengen release, but there's no evidence of that yet).