Difference between the AirPods

There is no difference. Wireless charging capability is the only difference.

You may, if you wish, use a certified Qi-wireless charger to charge the AirPods in a wireless charging case.

Charge your AirPods with charging case and learn about battery life - Apple Support

Actually, according the Apple, the newer ones have a chip that will enable them to pair more quickly, in addition to supporting "Hey, Siri" functionality, I guess for if both of your hands are occupied?

But what is the difference- do the wireless AirPods charge with a wireless charging pod? I’m confused

Ferd II is correct.

dumonj320 addresses the difference between first and second generation AurPods, which is not what you asked.