The G.Skill website doesn't even list the USB3.1 version of that board, only the earlier Z97-E, that I can see, so we can't go by that.
The QVL lists generally only show a bare minimum selection of tested models compared to the entirety of what's out there and might actually be available, so we can't go by that.
Most Intel platforms have very good memory compatibility with a broad range of speeds and timings, so I'd be hesitant to say they won't work, and inclined to say they would, but obviously this is a board that was released late in the product cycle for that chipset, probably just shortly before the Z170 chipset was released or even after it was already released. That means it's very likely, and in fact obviously is the case in this case, that the memory manufacturer never tested compatibility against that specific model because they had already done all their Z97 compatibility testing and weren't going to go back and do additional testing for another model that mainly only added USB 3.1 support (Which is really just USB 3.0) even though there might be OTHER significant differences between those boards.
To be honest though, there was a pretty fair amount of testing done on the Z97 platform regarding memory performance and it was fairly convincingly shown that overall performance didn't gain much by going above 1600mhz. Especially if gaming is the primary use case for this machine. If it's being used for scientific or media applications like CAD, folding, encoding, high resolution video editing, etc., then you MIGHT see some benefit from more and faster RAM. But for the most part we had seen little gain going from 1600mhz to 1866 or 2133. I'm not sure that 2400mhz was even used in any of the testing I saw done but whether it's worth it or not probably depends greatly on what you have now and what you are using it FOR, plus, how much the kit is going to cost you?