Generally speaking, the rpa and rpy documents are informations for the game what to use. Open notepad, fill it with the required text, save it as a pure text file "patch.rpy" in the "game" subfolder of the game. Since here it is general, the old patch should work fine and there's no need to do anything if you just copy it over like you did.
As you can see, the file does not contain any specific "outside" information about how the game should be changed because in this game everything is already included in the game, you just need to tell it to activate it. Other games keep it even simpler, they just see whether a certain file exists at all, no matter what the contents - it could be any excel spreadsheet about your gym plans, as long as it has the correct name. Others however will have the required changes within the file, so it isn't the same for every game. Since uploading sites often don't know this, you will be informed that it is an old version regardless of whether or not this actually matters.