You just made a post about this... As I said, you would probably keep the god kit/perks if you got staff.
Unfortunately because of the way they have the permissions set, you would lose your perks as a donor if you became a moderator. This is a problem that has been discussed before and I believe they're trying to fix. From what I've talked to mineterria about, aside from the /ban, /tempban, /mute etc. commands, mods also have access to /god, /invsee, and /fly commands. AFAIK, they don't even have permissions for pets or disguises.
Actually they have perms for /pet [Pet Name], If they donated before they got mod they Will keep the pet, cause MPG got hi's sheep and rachet got his blaze so they keep some of Them maybe It's a bug in the system, i don't know