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HELP ; What breed are they?!

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Hello :) I was wondering what breed these guys are. The little black one isn't mine, I call him "my foster horse" because his owner up and left him without a word so the ranch is allowing me to take care of him. It's been at least 3 months since i've been his foster mama, and I'm not good with breeds and can't figure out what type of horse he is. I'm not sure how old he is, but he hasn't been gelded yet and as you can see he's very young. The other one is mine. My dad purchased him from a lady who rescued him from a slaughter plant in nevada. He's about 3. The person who broke him for me said he's a mustang, but what do you guys think?