I did some math, and this is what I came up with for 2007-2010. I think this is about right.
Dice-k 44-24, 509.1 IP, 4.05 ERA, 5.92 IP per start, 474 K, 8.5 K/9
Beckett 50-24, 638.2 IP, 3.95 ERA, 6.52 IP per start, 610 k, 8.6 K/9
Whip I didn't do the math for, but Dice-k is 1.33, and Beckett is around 1.2. The only significant difference is IP per start, and wins-- although Dice might have had more wins if he stayed later into games. I also ignored Beckett's mediocre 2006 numbers.