The Colt progression was:
The Colt Trooper Mark III, the "J" frame.
The Colt Trooper Mark V, the "V" frame.
The King Cobra, the "AA" frame.
The Anaconda.
These four guns are the same basic design, with the first three being relatively minor modified versions of each other.
The Aanaconda is just an enlarged version of the first three.
Many parts will interchange.
The big difference here was the difference between the Trooper III and the Trooper V.
The Trooper III used a sintered steel hammer and trigger, a square butt, and had a standard "long action".
The Trooper V used a cast steel hammer and trigger, a redesigned lock work using Colt's first "short action", used a longer mainspring with a different location for the spring's mounting plate, and altered the Mark III's square butt to a rounded butt design, covered by the grips.
The King Cobra is nothing but the Trooper V action with a new design barrel. Everything else is the same.
For some reason Colt gave the King Cobra a new frame designation, the "AA" frame.
The Anaconda is just the Trooper Mark V/King Cobra, enlarged.
Some action parts will interchange, but basically the Anaconda is a King Cobra with a bigger frame, cylinder, and some internals.
The grip size is the same on all three guns.
Trooper Mark V, King Cobra, and Anaconda grips will interchange.
Mark III grips fit ONLY the Mark III guns.