No, not as such. The numbers on the yoke and hinge are assembly numbers and are NOT related to the serial number. Your butt and cylinder number match, so it is the original cylinder.

Parker-Hale also manufactured sights. If the name is just on the sight ramp, that does not say anything by itself about the gun. But they could still have worked on the gun.

Does the gun have any British proofs? To check whether the gun has been converted, you can also just try which live round fits the chambers. Conversions usually just involved reaming out the chambers to accommodate the longer .38 Special, although Parker-Hale in particular is known to have sleeved chambers to ensure a perfect fit for the slightly slimmer Special. If a standard .38 S&W round won't go in, that would be the case.