I'm not certain that will be a complete comparison.
The Upholstery Pro, at "open flow" ( a setting I rarely use it on, but for gross stuff you could need to) and 400 psi still doesn't push the water through in the way a spray nozzle at 200 psi would.
I've run stainless steel tools (with 02 jets, to be fair...not an 01) at 200 psi, and it really wets through the fabric.
I'd need to test that out for myself.
Is your scenario one where you're cleaning an oily synthetic fabric, or a durable cotton fabric that shouldn't brown, and has heavily imbedded soil?