What's the difference between the T_SMF_FM_FORGED_REPLYTO rule and the FREEMAIL_FORGED_REPLYTO rule?

[Mark London]

The T_SMF_FM_FORGED_REPLYTO rule was recently added I think, and it 
looks identical to FREEMAIL_FORGED_REPLYTO.   A mistake, or is there a 
reason for both? - Mark