Here is what I found for the 24 cards in Series #17 so far. I have all of the blank/Italy print run and I have most of the "A" print run. I only have two cards from print run "B" so there are probably more variations. I'm working on getting all three versions for Series #17.
Here are the back variations I've seen. I have yet to check for variations on the front of the cards.
17-07 Vitas Gerulaitus - 'A' has updated results
17-08 50 and 125 cc WCH - 'A' has updated results
17-11 Hans Schmid - 'A' has updated records mentioned his retirement
17-12 UEFA Junior Cup - 'A' has updated results
17-20 World Cup Skiing - 'A' has updated results
17-22 The Forest Hills Tournament - 'A' has different text and the sub-title is different