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Like Ryan said, I think I would lay 8-10 pieces together and see how they fit and how precise they are cut. Also stack a hand full on their edges and see if any are bigger than the others.
With square cut stone, if the sizing is real close, I like using a tight joint, about 1/16 and then use an unsanded grout. But, that's up to you, a larger joint can be used. As long as you don't over force the sanded grout into the tiles, I doubt you'll scratch them. Folks tend to have troubles when they open the joints to 1/8 then use an unsanded grout. Anything over 1/16 joint, I'd use sanded grout.
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