What's the difference between road bike disc wheels /cyclocross disc wheels?
The real difference to look for is the axle width and connection method. A "standard" road bike has a 130mm/10mm rear axle and 100mm/9mm front axle that both use a standard quick release.
If a set of wheels matches those dimensions and has disk brake compatible hubs, then any difference between road/cyclocross disk will only be in the various details of the build and rim width/depth.
However, many of the newer road/cyclocross bikes with disk brakes are using different axle widths and connection methods. Often the rear hub axle is 135mm/10mm, and many CX bikes are now coming with through axle mounts. These kinds of specs were previously only found on mountain bikes.
Many hub manufacturers ( especially on the pricy end ) now provide exchangable caps to allow you to switch between connection styles. But before you spring for those fancy carbon wheels, you should verify that the axle widths/styles match your current bike.