Changing hydraulic pump cartridge can give me more torque?

[LUIA HENRIQSON]

hi all,
changing my cartridge of 21 gpm to a small one 12 gpm I will have more torque whith less rotation in my winch hd motor? it's sound correct?
if yes have a formula to know how much more % ?
obs - keeping same pressure and same engine HP drive rpm .
in case of will need more horsepower in hydraulic pump drive no problem , the engine have plenty.

 

[Asymptotic]

http://www.nottco.com/fluid-power/about/resources/hydraulic-motor-calculations.html from Nott Company.