In my Gretsch G2022 the volume pot has 500k B printed on it while the tone has 500k A. Is there any major difference between the two? The reason I ask is that I have ordered 2 x TV Jones pots (250k/ 500k/ 1meg) - 1 each for the volume & tone. I was planning a straight-foward swap of both the tone & volume pots (after a little experimentation). Will the A/ B difference affect which pot I can install in which position? Thanks once again for any help. I don't wanna mess this installation up!