DEC RC25 / CDC 9457 lark disc

[shadoooo]

Hello,
I always have been amazed by the complexity and peculiarity of
fixed/removable hybrid discs like DEC RC25 and CDC 9457.
Looking at some specifications found on the web, these drives look quite
similar each other, even if these are completely different on an exterior /
interface point of view...
Maybe there's some compatibility between the two products?

Thanks
Andrea