Thread:User talk:CodeCat/Could you check this over/reply (3)

I don't actually know, but it does seem at least somewhat plausible that those two suffixes are related. Of course there's still the question of why the nominative has -ma and not -maton, and why the Latin suffix has a thematic stem while the Greek suffix is athematic (the Greek presumably reflects earlier -mn̥t-, the Latin reflects -mn̥to-m).