I'm getting ready to order a new 4x4 control module, but am unsure about the last two letters of the part number. My original is 1L54-7H417-AC. When I cross reference to the new part number (1L5Z-7E453-AC...old one discontinued) it shows that it replaces 1L54-7H417-AE. Mine, of course, ends in AC. What is the difference in the AC and the AE at the end? Will the new part work for mine too? Thank you!