Is the SRAM Eagle AXS Paddle Shifter Compatible with the GX AXS Shifter?

The short answer is yes. If you have a GX level AXS wireless shifter & derailluer and you would like to upgrade to the new AXS paddle shifter you can directly swap them out. The new paddle shifter allows you to do all shifting with your thumb instead of finger & thumb on the stock shifter. This is preferred by most riders because you can keep your finger on the brake while shifting on a descent.