Buffy ads from Tv Guide magazine

[Joan-b]

Hi there
I'm currently trying to collect all the Buffy ads from Tv Guide magazine (seasons 1, 2, 3 and 4), but I didn't know there were different versions
See below : one got a WB 11 WPIX and the other a WB 22 KTZZ
Does anybody know why ? I think it's because of the station but I don't understand I thought Tv Guide had only one printing of his magazine, sorry if my question sounds weird for some of you guys but I'm french
Thank you !

[after8]

WB WPIX was New York I believe and WB KTZZ was Seattle. (I checked these through a quick Google) All major city/urban locations would have their own TV guide becuase of different channels. For example, since I live near Michigan we got WB WDWB Detroit back in the 90s/00s on channel 20. I wouldn't try to get all of the station call-letters, as you would most likely have to find one from every state.

[Joan-b]

It's what I was thinking. I realized recently that there were many different stations on the ads I've collected, but I was just wondering. Thanks for the explanations