I think it depends on what's a 'noticeable difference' to you.
My opinion is that if one card gives me 65fps and the other card gives me 71fps, that's not noticeable. That's because if I played a game at those two framerates without knowing which one was which, and you asked me the framerates and which one was higher, I wouldn't know. I'd have to guess.
So no, there's no noticeable difference between 1060s no matter if one is standard clock speeds and the other is overclocked.
If you have some speed need, such as a gsync high refresh rate monitor, where every frame per second is valuable, then that's a different story.