tl;dr
30g Topre sorta like MX Red, MX Red is smoother though
45g Topre sorta to MX Brown, Topre is more pronounced at the tactile bump
55g Topre sorta like MX Clear, Topre is more pronounced at the tactile bump
Overall, in the MX Camp, I tend to like the Red, Clear, and Black (dislike the Brown and Blue)
45g is my favourite Topre, but the 30g and 55g rate higher than the Black and Clear for me. MX Red, depends the day, but I like it more than the 30g Topre sometimes.
(Yeah, I've tried all of them)