AFAIK, all pre-ribbon shortcuts work. (You just have to be quick with the Alt- ones!)

I usually use F1 (help) and type in "keyboard shortcut." From there I get this article in Word 2010. See Function Keys in Word 97-2013 for more ideas and links.

You can create a list that includes your customizations using the ListCommands Word command under the macros dialog (in Word commands). That might be the source of your other document.