Remember that often different amplifiers have VERY different tone shaping.
Soooo,,,,the same Cab sim circuit will come out Very different than what you may hear on a utube demo by someone who has had great results.
I use a cabsim circuit in my pedal setup BUT it runs through a very flat power amp setup. If I use that pedal setup into some Wanker brand name BS Amplifier that the kids rave about because some famous herd used it,, my cab sim will sound like Crap and I would have to rethink the whole signal path.
IMExperience,, very few Amps sold today will work well with cab sim setups as they are aimed squarely at MAX SPL and MAX Bandwidth so you have none and Buckley's chance of attaining the classic rock sounds.

IF that is what you desire then rethink you amp or bypass the whole front panel and just use the power amp.,,,, you may still have to change the speakers.
Phil.