Why different kv ratings for Feigao and Wanderer Motors?

[standard_63]

My 7XL is running pretty hot in my Supermaxx, so I'm thinking of either an 8XL or 9XL. I run 4s lipo and 1/8 diffs.

The Wanderer 8XL is rated at 1875 kv and the Feigao is 2084. It seems with Wanderer I can use an 8XL and Feigao C XL I would use a 9XL? Or are they just rated differently even though the same?

Or should I just go for the 1950/8? :)