As long as they have the same seat pattern(where the lug comes in contact with the wheel)they should be fine. I used the same lug nuts from my factory 17" Bullitts to my factory 18" Fan Blades and have had no problems.
you should be all set as far as lugs go... they are all 60 degree conical seats (same as the wheels) F.Y.I. if you do want to replace them they are 1/2-20 thread either hex works (3/4 or 13/16) but you cannot use chrome lugs on chrome wheels, polished and painted you are ok tho