You're getting multiple types of answers, reflective of the question needing clarification:

If the question is "The RMD is the most famous Swamp blade, what is the Yard's most famous blade?" Then the answer is the Dogfather.

If the question is "The RMD is the Swamp's most versatile all arounder blade, what is the equivalent in the Yard?" Then probably the 411.

If the question is "What Yard blade most resembles the RMD?" Then THAT answer is the SS5. It's blade profile, size, and shape is nearly identical to the RMD, with the addition of a thumb ramp and a different handle (IMO the mudder handle is the most comfortable of the Yard handles, so from THAT perspective, ALSO the Yards "RMD")