Mate 1600 vs Master 500

[Flyer69]

@"Number360"

No, but a 1600 mate qualifies as a 100 ton master. Also, the 1600 master is going to change with the new rules. I forget which way it goes but one or the other will be no more. It will either be 500/3000 or 1600/3000 master if you hold the one that is being eliminated you will receive the other one automatically upon renewal.

Please quote the CFR that validates this statement?