Quagmire,
It certainly is the same Mike Patton. He started Fantomas immediately after Faith No More broke up (rumours of a possible reunion at the mo). Mr. Bungle are sadly no longer with us either. Aside from Patton (Tomahawk, Peeping Tom, ex-FNM/Mr. Bungle) the band also features Buzz Osbourne (Melvins), Trevor Dunn (ex-Mr. Bungle/Secret Chiefs 3) and Dave Lombardo (Slayer).
Lombardo is busy on Slayer duties so Dale Crover (Melvins, Men of Porn, Altamont) is filling in on drums but is a legend himself. They have used the legendary Terry Bozzio in the past too to fill in for Lombardo.
I also suggest grabbing a copy of The Fantomas/Melvins Big Band Live DVD from JB Hi-Fi too. Awesome concert and great watching both drummers (Lombardo & Crover) together on stage. The actor Danny De Vito does audio commentary on it too as he's a huge Patton fan. Supposedly he's pretty drunk too but haven't listened to it.
Isaac,
Secret Chiefs 3 are still around. I saw them last time they were here at Fowler's Live in mid-'07. But preferred seeing them the first time they came out here in early '98.