It's actually a 40% range on standard pots. ±20% or a range of 40% total..
Don't swap out pickups. Really. Replace the Pots, caps, jack, and switch with regular Fender MIA brands. Spend time adjusting pickup heights and bass/treble tip with your ears. If you still need tone tweaks then source pots and caps in different ends of their tolerance bands (pots have factory spec 20% tol range).
I'd use a four way switch to give you the series humbucking tone of a Les Paul Junior. Rotate the control plate for Vol up front, then Tone, and Switch to the rear. Those are my Tele automatic mods.
For example, standard 500k pots can range from 400k to 600k. 200k range or 40% of 500k (from 80% of 500k to 120% of 500k)