Yosemite Upgrade changed numeric keypad "Enter" key to issue "^[33OM"
Actually, I found the simplest answer...  In Terminal Preferrences, Advanced Tab, I unchecked the box in the 'Input' options section: "Allow VT100 application keypad mode"

Now the keypad ENTER key is identical to the main keyboard ENTER key!

Simple and sweet, I found this when looking through the TMUX help information.

I didn't realize that the only place where the keypad ENTER was issuing "\EOM" was in my tmux sessions, since that is the default mode in my remote admin sessions.  Thanks for the information above, but this was all I needed to do.  I've I'd given more background people may have had better clues.