Are you asking if you can or if that's what it calls for? The build doc says B10K, but you could use an A10K, the pot would just respond a little differently (50/50 mix may not be at the 12 o'clock spot in the sweep, etc.).
Yeah as p_wats said it will work fine, it will just be hard to dial in. I wouldn’t recommend it, because 50/50 would be around 10-20% of the knob sweep, which could be tricky to dial in a sweet spot.
