I've done this. I've bought knockoffs of pedals I like so that I can put them on multiple boards -- an Eno "Rat Distortion" and a Henretta "Emerald Prince" (EP-3 preamp). The only true duplicate pedal I have is one of the "least TGP pedals ever" -- a CS-2. I love the one I bought in 1992 and always have. When I found that a buddy had one he wasn't using, I traded him a Pedaltrain 1 that I wasn't using for it.