Dadaism and absurdism are similar but distinct. Absurdism takes normal things and twists them in unexpectedly off beat ways. Lots of Monty Python sketches are absurdist, for example the famous dead parrot sketch is absurd in many ways, but the humour comes from a normal everday experience, someone returning an animal to a pet shop, and makes it absurd.
Dadaism takes away the normalcy requirement and attempts to make humorous connections between literally anything. An image of a hot dog wearing a powdered wig and a caption saying “its not Wednesday my chicks” would be dadaist, but not absurd, because there’s nothing about that thats meant to feel like its a twist on something normal, the humor comes from seeing such random unconnected things shoved together in unexpected, unusual, or surprisingly salient/intelligent ways.