Moving an animation from 1 rig to another in a separate Blender file I got two exact rigs in 2 separate blender files.
I need to move the animation from the rig in the one file to the same rig in the next file.

I have tried appending, linking, and just Ctrl+Copy Ctrl+Past; but every time the location and rotation comes in wrong.

I have been working on this project for over a year now... Please help!

Thanks.
Append the Action data block from the first file into the second file, then set the Action in the Action Editor.  There's no need to copy and paste.  If the rigs really are identical, connecting the appended Action should be all you need.

If location and rotation comes in wrong, I'd check the position of your Armature in Object Mode-- could be that you have values on it in one file or the other.