The only issue you might encounter is with MS themselves. They do keep a count of how many times you activate a license, and eventually will cut you off. Your parts will have different IDs, even though they are the same models, and so you will have to activate again.... probably. If you have to DL something at some point requiring you to "validate" then you definitely will.
I'm not saying that it's a big issue. I'm just pointing out that you are also spending one of your activations.