5k, 10k, in an amplifier as volume control it really does not matter that the resistance is double, it will make little difference, as source will not mind, and the input to the amplifieris going to be so much higher anyway.. in a tone control yes it will make a difference, so there you probably want to have the extra resistor across the outer terminals, and accept that there will be differences in the value between the wiper of the 2 variants.