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@Scilly.Suffolk
There are two generations of Super Record RD and two versions of the second generation, i.e. three in total (both versions of the second generation were available in a gloss or a matt finish and versions using both gloss and matt parts exist).
Yours are both second generation, version one and dating from between 1978 and 1982.
These had removable body springs which were held in place by the bolt that sits between the two rivets on the upper pivot point; the body spring was not removable on V2 mechs, so there is no bolt.
The "Super Record" engraving on the rear plate ceased in either 1981 or 1982.
The mech on the right has the correct pulley cage plates, which are fastened from the rear by a screw-headed bolt and nut. However the bolt which secures the mech to the frame hanger is incorrect: it should be hollow as per the bolt on the left hand mech.
The mech on the left has a later plate into which the bolts screw from the front.
I hope this helps.