Only the 1×1 keycaps, the Tab, Caps Lock and left Shift can be used on a keyboard with Cherry MX, and the Caps Lock on only a few of those.
The stabilised keys (2×1 or larger) are not compatible with Cherry MX and the keys on the bottom row have offset stems for some unknown reason ...
These keyboards in German layout are very common. If it had been (rare) Swedish/Swedish layout, or even Danish or Norwegian then I would have bought it straight away. (would have been my fifth G81 keycap donor, I think...)