Don't know if they are the same, but...
I just brought my E23 home from the lake yesterday, and intend to pull the spreader brackets off and check on having some duplicates cast or fabricated. Don't laugh, the 23 uses a relatively large section mast (6.5" X 3.25") that is the same as the early 25s and I think 27s. If this works out, I'll have 10 or more pairs made up and put them on the shelf, as there seems to be quite a demand.