If your new wheels are the same diameter and width as your existing wheels, then it is acceptable to reuse your existing tires on your new wheels.
We strongly suggest reaching out to your local dealer or tire shop to verify that this would be safe to do.
We also strongly recommend purchasing a new set of tires with your new wheels. There will be much less chance of potential issues, such as balancing the wheel / tire combination properly or ensuring that the tire is the correct size for your new wheels.