It’s interesting that there are a few sports that are varsity at some schools, but not under NCAA. There are also some NCAA sports that only a small number of schools have at a varsity level, like bowling and rifle.
I have just assumed that schools generally follow NCAA rules even for non-NCAA varsity sports, but haven’t really looked into it. Crew, squash, sailing etc. are not big money sports so the temptation to go outside NCAA practices may not be that high anyway.