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Width, center bore, and offset are the main things.
Width is a range to suit the tires, for 245 tires it's going to be about 8.5 or 9" (245mm = 9.6 inches, ideally you want the wheel to be a little less than that). For 275 tires it's going to be about 9.5 or 10".
Center bore needs to match. If it's a lot bigger you can use a ring that has the correct inner and outer diameters. If it's slightly bigger you shoudl avoid the wheels as there won't be enough room for a ring. If new wheels are smaller bore, things won't fit to begin with.
245 and 275 tires are fine for width, I have them from the factory. Your aspect ration (45 and 40 are sidewall height as a % of tire width. Again yours match the factory.
So it really comes down to offset. What is it for the new wheels? Too high and they might rub the suspension, too low and they might rub the fender sheet metal. Mine are 38 front and 48 rear, but there is an acceptable range they can be changed within.
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