What is the difference between find-grep and grep-find?

Question

What is the difference between find-grep and grep-find in Emacs?

Answer 1

They seem the same. See the manual

Answer 2

You can use M-x describe-function (or C-h f with default keybindings) to answer this question, here's the output for find-grep:

find-grep is an alias for `grep-find' in `progmodes/grep.el'.
(find-grep COMMAND-ARGS)
...