Github/compare: How to diff two different files (different file names, both in HEAD)?

Question

Can I use the github /compare to display the difference between two different source files in HEAD?

Here is how I do it on the command line with git d

Answer 1

I have been using this third party online diff tool for a long time, if you like, you can use it as well. https://www.diffchecker.com. But it seems you should manually paste the two files onto it.