Why does comparisons sometime yield different results?

[Rod-at-DOH]

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Question

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I use the URL compare command in the browser to compare one branch to another in a repo. Doing something like this:

https://github.com/MyOrganization/MyRepo/compare/branch1...branch2

In comparing some branches which are closely related, GitHub will report them being identical. That's cool and all, but just for grins and giggles, I thought I would switch the 2 branches around. Sometimes they were still marked as being identical. But sometimes they were not marked as being identical.

Why is that?