Hitting this error, after downgrading to the only 13.7.4 version that apt-cache shows as available:
GitLab version mismatch:
Your current GitLab version (13.7.4-ee) differs from the GitLab version in the backup!
Please switch to the following version and try again:
Is there a source for a 13.7.4 (no suffix) version to be installed to receive the restoration? Or is there a kludge to force it to work with the “-ee” version? Or in the worst case are there instructions for custom compiling a version of 13.7.4 that will work?