They definitely aren't using the same ICs, so it's doubtful they have the same secondary and tertiary timings. Primary timing are not usually where trouble happens with incompatibility, although it certainly CAN be.
I don't like the idea of using a memory module made by a company who produces them as an afterthought. I'd prefer to use a product made by a company whose primary focus is on the quality and performance of their memory and has a track record of excellence in both areas. Gigabyte, isn't that company. They make satisfactory entry level motherboards and excellent high end boards, usually, but they are a relative newcomer to the production of memory modules and even though they are mostly using high quality ICs and silicon, I just don't see them being on the same level as G.Skill, Corsair, Mushkin, Kingston and a few others quite yet. Even so, chances are good they will work fine. I'm just finicky that way when it comes to memory.