The southern browns I catch here look a bit different. Same idea but the colors are not as saturated, washed out and brownish greyish and the contrast is not as great. Speckled it is but not nearly as pleasant looking as the one in the OP and others like that which I've seen and some bought at LFSs.
Perhaps it is an age thing too as I catch only bigger ones, ~10"-12", albeit I've had a 12" one that I bought from a store (Aquarium and Puppy Center in Waterbury IIRC, Connecticut) that looked better, closer to the OP one.
Hence, it also can be water chemistry. Our waters here are hard (FL is ~ one big ancient coral formation), on the alkaline side, and often low end brackish. The LFS water is often fresher, more neutral, not as hard. It appears that the w/c bullheads wear a thicker slime coat, which gives rise to more opaque, washed-out, pale appearance.
To save my 1000 words, I should take a picture next time or if anyone from southern FL catches them, please, post yours.