Although not finished, I was playing around with both last night and was surprised by how different they sounded.
The two circuits are very similar, although the Matamp one has the drive pre-eq and the Orange has its drive post-eq. That may well explain the tighter bottom end on the Orange.
Anyway, I'm thinking that I may have to do two versions of each: a smaller, 125B enclosure with five knobs (treble, bass, gain, boost and master volume) and a larger (1590BB) enclosure with the FAC switch.
The FAC is a six position switch which changes the input capacitance (and therefore tone) to one of the gain stages. Again, the position of the FAC is different on the Orange and Matamp models. The Orange has the FAC situated after both the eq and drive sections, whereas the Matamp FAC is situated before the drive and eq sections.
Aaanyhooo. Once they are done, I shall recommence work on the Sabbath tone pedal, which is a modified Rangemaster treble booster into a Laney Supergroup-in-a-box.
Unlike Catalinbread's Sabbra Cadabra (which sounds awesome, BTW), mine will have independently switchable treble boost and distortion and more knobs (two on the TB, six on the distortion side) as I want it to be as flexible as possible.