Ahles, a junior from San Bernardino, Calif., has played 89 snaps with nine total tackles, one tackle for loss and two quarterback pressures.
Beatty, a senior from Hawaii who was the starter last year, has played 88 snaps with two sacks, two other tackles for loss and five quarterback pressures.
"Tyler is a little bit bigger, you know, I think a little bit more physical that way," coach Dan Hawkins said. "I think probably B.J. has got the upperhand a little bit when it comes to quickness maybe, although when they ran 40s in the spring, Tyler was the faster of the two.
"So, very similar, very tenacious, very good motor guys."
Ahles has made slow and steady progress during his four seasons in Boulder, playing mostly on special teams at first in 2008. He has made the most of his opportunities, several of which have come when Beatty has been injured in the past. He played in every game on defense last season.
Beatty has earned playing time on defense in each of the past three seasons. He is in his fifth year in Boulder and has 23 games of experience under his belt going into this week's game against Georgia.
Beatty won the Iron Buffalo Award among the linebackers in the offseason for "hard work, dedication,toughness and total poundage lifted in the weight room."