lol no. asus as msi use industry standards. frankly, everybody uses industry standards.
the only thing I don't get is going for a 6700k - that's sole purpose over the 6700 is overclocking as benchmarks show basically no difference in gaming between those two - but pairing it with a B150 board. If you haven't bought the parts already, I suggest either "downgrading" the CPU to a 6700 (non k) or upgrading to a Z170 board
whether it's MSI, Asus, Gigabyte, ASRock -- the PCIe standard is the same for everyone