Thanks for the information.If you contact Spyderco, they can hook you up with a clip. I got a spare clip and screws for my RockJumper a couple of years ago. I think it cost me $8 plus shipping. I actually did it by phone. One of the perks of a good American business like Spyderco is that you can call them and talk to a real person. While I don't expect that there would be any issue with swapping clips between Enduras, I bet they could tell you.
I've since upgraded my RockJumper to an MXG clip. Sure, it costs a lot more than $8 plus shipping but I definitely recommend checking them out if you're already thinking about changing your clip. Having been using MXG clips for a couple of years on a couple of models now, I really love them.
I live in Austria, so in Europe. That might be an obstacle, especially regarding shipping costs.
I'll give it a try.