Will Gladiator Wheels Fit a Jk?

Yes, they will fit. Look for "Rubicon Takeoffs" in the member marketplace. There is no difference between Gladiator Rubicon wheels and Wrangler Rubicon wheels.

Are JL and JK wheels the same?

JL wheels have the same width and backspacing as JK wheels (not including base 16s). It's the wider axles of the JL Rubicon that allow for the wider tires.

Are Jeep wheels interchangeable?

Jeep Wrangler wheels are interchangeable with many other Jeep vehicles. There's also a lot of Wrangler wheel cross-compatibility between generations.