No, sir...Annie and Beau are not related except by breed.
Annie is almost six months to the day older than Beau, and came from High Point, North Carolina. Beau came from Apex, North Carolina. For whatever it's worth, both of Beau's parents were AKC champions. His sire, Silverhill's U Got Game ("Moses"), was owned by a former NFL player and sired Beau's litter at the age of ten. I had the honor to photograph him shortly before he passed away from cancer several months after Beau was born.
Regarding their similar markings, like all breeds recognized by the AKC, there is a breed standard for Rottweilers. Their "official" color must be black with mahogany markings. The mahogany can vary slightly in hue, but shouldn't be straw colored. They can have no white markings at all. They have to have the spots above each eye and the mahogany markings on their chest. Their lower legs and paws must be mahogany with a black "pencil mark" on each toe. If you look at Rottweilers, Dobermans, Black and Tan Coonhounds, you'll see that they all have similar markings. As do the black and mahogany Dachshunds.
I'm not a big fan of the AKC and their often nitpickety rules and standards. Rottweilers are born with tails, of course, but they are "officially" a docked breed. But tailed Rottweilers are making a comeback. I accept that they're a docked breed, but I don't particularly care one way or another. I don't like it that Dobermans are supposed to have their ears cropped. Ditto for Great Danes and Pit Bulls. I like them natural. I'm okay with removing dew claws, though, as they can become a problem as the dog grows up.
But really...don't get me started on the AKC and breed standards. Probably told you more than you wanted to know already.