Women shoe sizes in Nine West and Kenneth Cole shoes?

I’m planning to buy a pair of Kenneth Cole sandals online since I couldn’t find one in my size in the stores.

I’d like to ask those who have both Nine West and Kenneth Cole shoes if there’s a difference in their sizing. What I mean is, I’m a size 6 and yet sometimes on certain brands I go for size 5.5 or even 6.5. Since I have Nine West size 6 shoes, this is what I’d like to compare with Kenneth Cole if they generally have the same size.