As regards the Outer Impact dovetail mount, it won't work on the 97B, but it's not because of the dovetail. The dovetail is the same on both the CZ75B and 97B.
It won't work because whereas on the CZ75B the sight rail is on top (proud) of the slide that the Outer Impact mount fits against, on the 97B the sight rail is flush with the slide so there's nothing for the mount to fit against.
That's a shame as the OI mount for the CZ 75B works great. I've not found another mount that offers such an immovable system. Other systems rely on just the dovetail mount and sometimes screws forced against the top of the slide which for my purposes is not secure against movement.