While pressure and velocity are closely related, Peak pressure (what gets your pressure rating and what will cause pressure signs) often are not.Still in my experience with the same bullet weight, recoil increases when you increase the pressure because the velocity is increased.
A faster powder will cause higher peak pressure with typically lower velocity than a slower one because the dwell time of the pressure is longer.
One of the problems with going to the lighter weight bullets in standard pressure 38s to reduce recoul is good old Isaac Newton shows up, Most of the lighter weight loads that expand don't carry the momentum required to penetrate