1
Ackley has projectable power...Reed never did. Ackley has a ++ eye, Reed had low K/BB but never was scouted as being unusually tough to pitch to and work counts with. Ackley has a quick, compact swing...Reed has always had a longish swing and slider-speed bat. Ackley has a very still head and great pre-swing load, Reed was always an arm-swinger and his head always pulls off the ball (and probably always did).
They're about as similar as Branyan and Bonds...they share a common attribute...good at making contact (Branyan and Bonds have about the same power. :) )