Are the wheels of Thule and Burley two wheeled trailers interchangeable?

They do both seem to use wheelchair-style, push-button, removable hubs. Since there aren't very many manufacturers of wheelchair hubs, my guess is that they would be the same.

Buy from a vendor with a good return policy...

Got a reply from a dual owner (burley and Thule) that they have a slightly different axle-witdh (should have been thickness). :( https://thismombikes.net/child-trailers-chariot-vs-burley/

For anyone still searching the internet for a definitive answer to this question, I have one!

The Burley axle is indeed just a hair too long, but at the same time too short. The plastic brake housing extends past the bearing on the Burley version whereas the Chariot is close to flush. The two brands are annoyingly similar but just different enough - same axle diameter, same bearings, same brake layout, close to the same axle length, and 10 spokes vs 12. I pulled apart both sets of wheels trying to get a solution that wasn't destructive. In the end, the easiest (and cheapest) answer is to cut, sand, or otherwise trim down the Burley brake housing about 3/16". If you do that, the Burley fat wheels will work perfectly, even the brake. What's left of the housing will act as the bushing against the trailer body so the more you sand down the hub beyond when it connects, the more horizontal travel you'll have on the axle. Not a problem, just a minor annoyance if you're picky.

Photos here: https://photos.app.goo.gl/4QwgkM5UqLPa7rq16