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I don't think this is exactly what you're looking for, but there's all the groups with just one letter different:
1. Phi Kappa Sigma / Kappa Sigma (this actually confused me for a while freshman year, and I walked into the Phi Kap house thinking it was the Kappa Sig house. Stupid freshmen)
2. Phi Kappa Psi / Phi Kappa Sigma
3. Pi Kappa Phi / Pi Beta Phi (even more confusing because on my campus, we refer to both groups as Pi Phi [I've heard a bunch of different stories as to why, but really not sure how that came about] which eventually lead to the fraternity being known as "Guy Phi")
4. Pi Kap / Phi Kap
5. Pi Kappa Phi / Pi Kappa Alpha
I'm sure there are some others. I think the conclusion we can draw is that the letters Pi, Kappa and Phi were very popular at some point.
ETA: Also, Chi Omega / Alpha Chi Omega
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