Daedalea quercina is very similar, but it doesn't bruise, has thicker pore walls, causes a brown rot, and prefers oak.
Arora says Daedaleopsis ambigua "is a similar southern species with a whiter cap." He describes D. confragosa as "reddish-brown to brown to grayish, sometimes blackish in old age" (p. 588). Polypores and Similar Fungi of Eastern and Central North America does not list D. ambigua but describes D. confragosa as "yellow-brown to reddish brown or grayish brown" (p. 111). So, I wonder. . .