Is it possible to work freelance for two different makeup lines in one store?

Would it be ethically possible and acceptible to work for two different makeup cosmetic lines as a freelance artist in the same store as long as it was on different dates or does this sound like too much?Is it possible to work freelance for two different makeup lines in one store?
it should be ok, if you didn't sign on to work with one line exclusively, or unless you have a clause in your contract, that expressly forbids it. the make-up artists at ulta stores work with all the brands they carry. check your store's policy, and see, what the manager thinks.