not much... if any at all.
what you're making is a frequency filter with a resistance and capacitance in series.
In theory I don't think it should matter which way around the components are...
Capacitor before the resistance of the tone pot to ground (BKP)
or
resistance of the tone pot before the capacitor which goes to ground. (SD)
the BKP way means to don't need an extra bit of wire going from the Vol pot to the Tone pot.
I've always done it the BKP way unless I've been messing with a 2 Vol w/ shared (master) tone wiring setup.
