A determined man with a hammer and a welder and an acetylene torch and some steel scrap
can make it work, but.....
The big question would be what kind of equipment the K241 came out of.
The John Deere K241 spec was different from the cub cadet spec and the Case spec.
You'd like that K241 a lot better on a 210, even if it's a John Deere spec engine.
The 200 series was built around the Kohler K-series engines.
The 318 engine was originally an Onan, mounted differently than previous John Deere LGT's.
If you want to keep the 318, consider a repower kit from one of the vendors that specialize