That's not accurate - the Redhawk and Super Redhawk are not the same action. They share a lot of common parts in the cylinder assembly and a common cylinder frame size and shape - minus the "nose" of the SRH and the grip frames/grip tenons.Interesting about the trigger since they are identical guns except for the barrel length.
The Redhawk is a unique action to the Super Redhawk. The Super Redhawks use a dual spring action, a mainspring/hammer spring and a trigger return spring. The Redhawks, on the other hand, utilize only one spring to drive both the hammer and trigger.
Super Redhawk - Note 2 springs: Parts 25 and 54
Redhawk - Note only one spring: Part 25 (Part 54 here is the trigger guard latch spring, does not touch the trigger). You can see how the mainspring - part 25 - drives the mainspring strut AND the trigger reset.