The 17s are not going to fit without other mods. 18s just fit. You may be seeing WK2s with 18 inch wrangler wheels, rubicon maybe sahara I think.
You own the wheels so it won't hurt to fit one on the front and check clearance. There is wheel to wheel and jeep to jeep variances, but the few folks I've read about here that tried this received no love.
The trim matters as I think all 2011 overlands had HD brakes. If you look at the rear rotor and see vents, you have HD brakes.
You could replace the HD fronts with standard front brakes just to fit the wheels, I think it is just a couple brackets and rotors.