Say I have two 8 pound planes that are the same and one balances with the battery near the C of G but because of wood weight and other variations the second plane which weighs the same needs the 5 ounce battery moved back near the tail to balance at the same C of G.

My question is am I going to notice a difference in flying characteristics cause I have more mass closer to the tail in the second plane than in the first?

I have heard it is better to have aileron servos close to the fuselage cause it keeps th mass closer to the C of G What about the added mass close to the tail even though the C of G and the weight of both planes are the same?

Thanks,

WRK