Rekordbox link with cdj's

I had installed Rekordbox, and when using it with Pro DJ Link, I could link it to my CDJ's and drag and drop music onto each of the CDJ's via my laptop screen and the Rekordbox GUI.

I have since had to sell my CDJ's and instead bought a DDJ SZ and started to use the demo of Rekordbox DJ with it, which is great.

However, I went to a gig the other day where I would be using CDJ's again (not the DDJ SZ), and found that with Rekordbox DJ installed, I could no longer link to the CDJ's even though they were connected to the laptop using Pro DJ Link.

Is there any way around this, as I want to have Rekordbox DJ installed to run my DDJ SZ at home, but I also want to be able to use it with CDJ's via Pro DJ Link. I don't really want to use USB's, as the screen on the CDJ is too small for my liking, so I prefer using the Pro DJ Link option.

Is this possible with Rekordbox DJ and the drivers for the DDJ SZ installed?