1936 Goudey R322 front/back combos

[DaveW]

While working on the front/back combos for the 1936 R322 set, I made an interesting discovery. The "plays" on the backs of the cards are identical to the plays on the backs of the 1935 R325 set (the Knot Hole League Game cards). Here is an example for card #2 in both sets:

In order, these are R325 front; R325 back; R322 back

As you can see, the text and the font is identical for both sets - they must have reused the plates.
What's also interesting is that while the front of the Knot Hole Game cards says that there are 100 cards, only 24 cards were ever issued (Goudey printed sheets of 24 cards, so this makes sense). But the 1936 set has 25 card fronts and 25 different card backs - which include all 24 of the known Knot Hole Game backs plus one new one. Why did they make 1 extra back and 1 extra front?

Note: Most publications say the R325 Knot Hole Game cards are from 1937, but that doesn't really make sense. There is a 1935 copyright on the card and the 2 teams mentioned on the front played in the 1934 World Series (Cards and Tigers).