In my experience, Impulses converted to Kemper format with the Cabmaker doesn't sound as good as them loaded using a plugin in the DAW.
Here is a test I did using the same Impulse to record Top Jimi's Super Lead Merged rig with the Impulse converted using Cabmaker. XLR with cab emulation on into the DAWlvs Monitor Out with cab emulation off into the DAW and loading the same impulse there. The second part of each clip is the converted version.
Yes, they sound very different. Like 2 different IRs. I think Kemper should actually allow users to use real IRs or either converting them properly. I was very excited about the Cab Maker when it was released but after doing some A/B tests and noticing the very noticeable sound differences I decided not use it.