It's the CoolerMaster HAF 912.
I already know there are appropriate mATX holes, I just wasn't sure if the standoffs included were compatible.
Compatible in height then yes, positions then no and you'll need to move the bottom 3 standoffs and use 2 of those moved, to the mATX positions which should be imprinted on the MOBO pan otherwise eyeball them. Never allow a standoff to NOT line-up with the MOBO's screw holes. Only the bottom (3) need to be moved (up). Most mATX use 2 instead of three holes on the bottom B + (R or S) (B, R & S are mATX only); see image.
(rotate counter clockwise 90 deg/ F-J-M are the top)