Hi Neil,
It looks like the component selection does not match the intended center frequencies and could be off my as much as 2 times higher. For example, the lower circuit looks like it has a center frequency closer to 200Hz.
You can investigate this using the following formulas:
f=sqrt(R2+R1)/(2*pi*C*sqrt(R1*R2*R3))
G=1/((R1/R3)*2)
Q=R3*(pi*f*C)
where
pi=3.14159...,
R1 is the input resistor (1k in your circuit),
R2 is the resistor to ground (680 in your circuit),
R3 is the feedback resistor (560k in your circuit),
C is the value of EITHER capacitor with both caps the same value (0.047uf in the lower circuit).
f is the center frequency,
G is the center frequency gain,
Q is the 'quality factor' of the circuit which reflects the bandwidth, higher Q lower bandwidth, lower Q wider bandwidth.
The Q is somewhat high too so you may want to play around with that to see what effects you get.
To be more exact, the value of R1 above changes as the attenuation pot is adjusted. To check min and max frequencies, do the calculation with R1=1k and then do it again with R1=11k. That's because the pot adds resistance to the R1 in the circuit (makes it look bigger) for some settings of the pot, so that needs to be taken into account also. If the calculation is done with R1=1k and R1=11k you'll know the effects and can see if that will bother anything.
If the pot value is changed then instead of 11k you would use R1=1k and R1=1k+Rpot/2 where Rpot is the resistance of the pot (20k in the schematic). So if the pot is changed to 10k the max value for R1 would be 1k+5k=6k instead of 11k.