I'm not the one to answer this question but here is an example from my experience.
I had a stockesh converter that was tweeked to stall around 3000 rpm. To cause the body of the car to take a load on my brake peddle, i was stalling the car at 2200 rpm.
My 4200 stall converter create the same aka Equal load, on the car at 1800 rpm, but stalls at 4200 were my 3000 converter stalled a 3000(actual 2800 rpm)
