S25, S25.1, S25.2, S25.3 - Sport for Peace - Beijing Olympics: Four Different Varieties

Thanks to our friend in Geneva, we now have confirmation of the fourth color/gum combination; the purple band with cream gum (S25.3). He also provides us with a clue as to when this began. For S23 and S24 (NY standard postage 2008), the 42 cent United Nations personalized sheet has blue-green gum (S23) and the 94 cent United Nations personalized sheet comes with the cream gum. I had not noticed this before, and can confirm I have these combinations. Check your copies, I would like to find out if these exist in different gum formats.