No you can't use them for the OD820. Like the Klon this has a clean and dirty path which are panned between by the dual gang pot, and you can't do that unless the resistance is changing on both side simultaneously.
Why don't you just use two separate pots, then you can control the clean and dirt levels independently which I think makes this and the Klon (and similar) more versatile.
I do reckon those pots would be really cool for some things though, I didn't even know you could get them with that sort of control. You could have a dirt pedal where as you turn anti clockwise you could control the gain in the feedback loop like a TS pedal, turn clockwise and you could add shunt diodes to the signal path like a Rat. You could use them for some really funky stuff. Where did you get them from, I want some!