Unless the difference is 1/2" to 3/4" diameter or more I don't think there is much of a benefit for changing disc sizes, unless it goes with a better caliper(aka 2 piston or a bigger single piston for more pressure). I would probably turn the od of the disc down to fit the caliper, just have to watch the air holes so they don't get too close to the outer edge. If it is the .590" bigger(.295 per side) it may be worth it, but I think if the caliper that went with the bigger disc is wider and uses a wider pad it may be worth getting the caliper also, to gain the most out of the swap.
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