[Radioroslyn]

I think what you'll find is that C-302 does 2 things. It filters negative voltage on the avc line. But it also maybe acting as part of a timing circuit thru the 2.75M back to the volume control. In this capacity changing the value won't change the voltage but will change the lag time before the avc voltage shifts from high to low when going from a weak station to a strong one.
Personally I wouldn't give much thought to the minor differences between the values of the two cap.