Ok, I realized since making this thread that the easiest, and fastest way to do this will be to back up my games on the 3tb drive, and simply reinstall them without having to re download them all.
Really wish it were possible to just reinstall the OS from a clone, and have only lose the windows activation while everything else is still linked.
Also new MB's have new drivers so it really would be better to freshly install. I see that now. Sigh.