They are the same design Paul but I have not seen the axle dimensions the same on Victa mowers compared with the Sunbeam.
I would say the axles are not interchangeable from Sunbeam to Victa or vice versa.
I think the Sunbeam base is a separate casting for the 4 stroke and 2 stroke with the orange/brown Sunbeam.
I think the 2 and 4 stroke die is the same but when casting the 4 stroke base they bolt a extra centre piece onto the die and that creates the larger void in the centre for the 4 stroke.
It looks like the centre of the die is interchangeable .
I may be wrong about the die but this would explain why the 2 stroke base has the 4 stroke engine mounting casting.
