Well, I suppose that is not up to me. Moderators?
However, I shall point out that in addition to both being produced by CTW and both involving Bill Cosby, Joe Raposo and possibly others, at least three of the "Sesame Street" Muppets made guest appearances on "The Electric Company." I do have the following three episodes from Noggin: Big Bird appears in show #131 (the first show of Season 2) and asks Fargo North how to get to "Sesame Street." The others are both from Season 4: Oscar The Grouch sings a duet with J. Arthur Crank in show #453, while Grover drops in to Vi's Diner in show #491.