Possibly brothers?

Hi! My wife and I rescued these two pups back in September. According to the shelter, they were found in the same place and both had mange so we all guess they’re brothers but not totally sure. Echo- the one with spots- is a huge barker when playing and loves to pounce on everyone. Zeke is an ankle biter who loves to run. Both extremely food motivated and ridiculously smart and big cuddlers. They weigh about 45-50 lbs now but are quickly growing and almost as tall as our black lab. We want to do DNA tests but haven’t gotten to it yet and want your opinions!