I recall one year ('78 or '79) when the Defenders and Crossmen were playing the same closer (New York, New York). Defenders had the flag line on their backs and the horn line stepped over them in a company front. We called it the "walk over". The second time we saw Crossmen that year, they had added something similar. Their flags were on their backs on the field, but perpendicular to the horn line's company front and did more of a "walk between". That was as close to "copycat" as I had seen to that point.
Crossmen finished in the top 12 that year (I think), so we were probably seen as the corp that did the copying. It bothered me a little at the time. Then I realized that was very much a compliment.