Go with what you have. As others have already said, many times people will even make a special purchase so they can intentionally make their quilt in the same colors/fabrics as the instructor. They make the samples for those classes to give ideas for the students anyways. Since you're paying for the class, I would find it completely absurd if the instructor took offense at you selecting the same color combination. (Now, if you were to go into the LQS, snap photos of the quilt & then neither pay for the class nor buy the fabric from them, that WOULD be wrong! ... but you're not doing that)