Were there any well known matches between Kosen Judoka vs. BJJ ?

Far as I'm aware all Judoka in Pride were Kodokan.

I heard of Yuki Nakai and that he was Kodokan but trained often with Kosen Judokas and eventually switched to BJJ after Rickson Gracie.

Also, any particular differences between BJJ and Kosen Judo groundwork? Besides the obvious being illegal Judo techniques such as leg locks.

Edit: Spelling errors.