I tried to submit job from HoudiniFX 19 and 18.5 to a farm 19.5, but it always returns xmlrpc invalid token error.
Submitting a job from HoudiniFX 19.5 to the farm 19.5 is fine.
Is it possible to do that or not, I tried to set hfs path to different distros, but it seems doesnt work too.

rhe farm needs the correct version, I guess. You can open files with created by a lower version, but most of the time there are some error messages, probably these will break the process