Though i don't have any conclusive evidence, I'd say that yes, there are two slight different varietiers of the brown cherry
1. the light brown- This is (I think) the version that cherry sells to other manufacturers. Sometimes it's impossible to tell the difference, but i'd say that they're a tad less tactile.
1. the dark brown - I see them in cherry-made boards. They've a bit stronger tactile curve and imho they feel a bit smoother.
Realistically, they're probably use the same exact tooling, but one is made with different materials... hmmm
It might be a generation thing too. We should do some investigating with various brown switches from the last 20 years. This subject is of great interest to me.
edit: After reading the previous posts, I see that I've added nothing new. Basically, I agree with sixty and italian.
Sandy (or perhaps one of the other Oriental Keyboard Aficionados?) made a comparison somewhere, and I may have it bookmarked.