The main difference between the two Anker 335 Wireless Chargers is that the latest version features a built-in USB-C port, specifically designed to work with the Apple Watch Magnetic Fast Charger to USB-C Cable that comes with the Apple Watch 7 and newer models. 

On the other hand, the older version was designed prior to the release of the Apple Watch 7 and has a built-in USB-A port, which is compatible with the Apple Watch Series 6 and older models.

As a result, if you own an Apple Watch Series 1 to 6, it is recommended to use the older version with the USB-A port. If you have an Apple Watch 7 or a newer model, it is advisable to use the latest version with the USB-C port.

If you have any questions, please contact us for further assistance.