It's not a horribly large change, essentially just rotate one of the brows (I'd suggest the lower one) just a bit and everything should be right as rain. It shouldn't affect present textures too much, just tilt one eyebrow a bit, and that only on the ones that use trans-maps on the brows. Even so, it's not a huge adjustment to fix the trans maps, or add a new one for use with the changed UVs. You can also leave them as is and just mention it in the readme so texture makers are aware of the slight rotation. I only noticed it because I was making some brow trans maps and thought I should mention it just in case. Either way, I'm fine with whatever you choose to do. :)