Whats the difference between 642PC, 642PC enhanced action & 642PC Pro

[HarryPottar]

HI

Is there much difference between the 642 revolvers?, apart from grips. I've always gravitated towards the performance center versions of S&W. Anyone got any insider information. Would like a Kimber k6 but hard to source.

PERFORMANCE CENTER® Model 642 Enhanced Action | Smith & Wesson

Model 642 | Smith & Wesson

Performance Center® Pro Series® Model 642 | Smith & Wesson

TIA

Harry