You can use the Planex with any vac you want, but some options are better than others. The Planex will produce high amounts of drywall compound/plaster dust and that dust will clog the pores of your bags very quickly. Quickly like in, it will clog you bag when it is hardly 1/4 full.
So that's why it is preferable to use the autoclean version of the CT because that one uses no bags, so there are no pores that can clog, only the filter, and that gets cleaned by the autoclean function.
I've been using the RO150 lately for sanding plaster in my home, combined with a cyclone on my CTL Midi, and it does work OK for me. Lots of dust gets caught by the cyclone, so my bags now last much longer.
But if you're a professional you might think about getting the proper tool for the job.