Protocol wise 1.024 and 1.025 should be compatible with 1.026. I'd go with 1.025 though. 1.026 only changed some minor achievement related stuff.
If you can't see each other games or it's not working, something else is probably an issue.
Depths of Peril, Kivi's Underworld, Din's Curse, Drox Operative, Zombasite, & Din's Legacy