The action on the 10 shot revolver is exactly the same internally, with the exception of the hand.

If the heavy pull is purely related to spring tension issues, you might take a look at the mainspring strain screw to see if it is too long. If this is the case, the screw can put too much tension on the mainspring. Many here on the forum incrementally modify (shorten) the strain screw length, or add an adjustable hex screw in place of the strain screw so that they can "adjust" the tension on the mainspring by moving the screw in/out. Substitution of the aftermarket spring you mentioned may also help.

Remember that substituting a lighter rebound spring will help lighten the DA, but will also lighten the SA pull too, so be sure to check the SA pull weight with a pull gauge after any changes with respect to this spring. I believe the consensus here is the 13-14 pound rebound springs give the most consistent results without causing trigger return issues.

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Ret. LE, FA Instr, S&W Armorer