Both are reverse audio. The nice thing about CTS is that if you don't like the split-knurled shaft you can swap the shaft out from any other 24mm CTS pot. You can only do this with CTS pots.
I know Bournes and Alpha both make 500k and 250k reverse audio pots... But I don't know the model numbers. Alpha makes them with solid shafts. I could only find the Bournes and CTS with split-knurled.
The Alphas are Asian spec, so they will fit the pre drilled holes in your kit best.
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