A25k Pot replacement for Phase II

Hi all, I'm just getting into all of this and I still have a lot to learn. Im goint to be building the Phase II pedal and I'm ordering parts now. The RATE pot is A25k and I can't seem to find those anywhere. My question is, can I replace this with a 20k or 30k and how would it effect things?

Thanks in advance to anyone willing to answer!
 
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