How to find my bobbi brown shade?

Im trying to buy Bobbi Browns Oil-free even finish compact foundation online, but im not sure which shade is mine, i called their 24 help center and their rep couldnt really help me, nor the "shade chart" .The best match for my skin ive used is Maybelline Dream matte mousse Cocoa Dark 3 an M.A.C. studio tech NW45. SO if anyone uses these products (including Bobbi Brown) and could help me find the right bobbi brown color that would be helpful.