Even if funds are tight, I would have the vet out to look at both of them, starting with the teeth.
One of my horses was fine when he was checked in late spring but, by Fall he had hooks on his molars to where he was quidding more than half his hay and losing weight. He could eat from the grain pan just fine but the hay got caught on the hooks of the molars when he tried to swallow
Perish the thought either of these horses might colic, the vet bill now, as a preventative, would be much better than a colic vet bill. Both financially and emotionally.