^^ Ha! At first I didn't read the title and then was like wow... identical.. different than what I remember
Anyway the circuits are nearly identical, but it is the little things that make a difference. Primarily in the diode clipping section. Things here can make a big difference. Even different colors of LED's instead of diodes can make a difference here.
Also some of the cap values can have an effect on low-end and high-end roll-off in the buffers and in the circuit itself.
I think you will find that almost all overdrives here are similar.
What bothers me is that, for boosting, you don't want much if any clipping. It is more like more gain with a midrange bump. In that case the caps and pots in the tone section make a difference as well.
Now if you are using it for tone as a dirt box, well then the clipping does matter.
But YMMV. With some amps I do like a little of both. High level for boosting and some clipping for flavor or a bit more saturation.
For blues tones I definitely like an 808 or Ts-9 or Bad Monkey type smoothness. Into a clean tube channel with some grit and boost, ala Bassman or even Hot Rod Deluxe or Champ, oh yeah...With some LED clipping..really oh yeah... For boosting Marshalls, Mesa's, Crate's, Sovtek's, etc. I try both and see what works, sometimes the SD-1 bite is just what is needed, but sometimes the TS-9 or 808 gives the girth and tightness without adding as much bite. All depends.