Yes, the Sig Sauer P365XL grip module is compatible with the P365X. Both grip modules share the same dimensions and magazine well, allowing them to be used interchangeably.
Key points about compatibility:
P365X and P365XL grip modules are interchangeable:
You can use either grip module on either pistol, as they are designed to fit and function with the same fire control unit and magazines.
Magazine Compatibility:
Both P365X and P365XL grip modules are compatible with flush 12-round magazines and 15-round extended magazines.
Different Slide:
The P365XL has a longer slide compared to the P365X. However, the grip module itself is the same for both models.

The P365X and XL use the same grip module.

Hi Andrew and welcome. You are correct. Frame dimensions are identical. This grip module fits either X or XL just the same. Cheers, stay safe and enjoy!

Good evening to you!! I suggest you contact Sig Sauer and talk with someone in the customer service department. You can contact them at the below link. Have a good rest of your weekend
sigsauer.com/customer-support