Answer: e*thirteen cassettes are all compatible with both XD™ and XDR™ drivers.
XDR™ is a freehub body standard designed by SRAM™ to allow the installation of 12-speed road cassettes on an XD-style freehub body. It is 1.85mm longer than XD™, but otherwise identical.
To use an e*thirteen cassette with an XDR™ driver, place a 1.85mm shim behind the cassette on the driver during installation.
Most wheels with XDR hubs will supply the necessary shim with the wheel. If your wheel or hub didn't come with this shim, you should be able to contact the manufacturer to supply a shim.
XCX cassettes are supplied with the necessary shim in the box!