No. You can use USB for Sidecar, but not for Universal Control.you can attach with cable??
So you started sidecar, then disconnected it?I found it as well not working. But in my case it was sufficient to start the screen mirroring from my MBP to iPad Pro, than turn it off and the UC started working immediately.
Of course all the usual requirements must have been met for the UC to work. Ever since updating to Ventura it was not enough but it looks like this workaround has fixed the problem for me. At least for now.