They aren’t 100% compatible, if you scaled them slightly they would line up.
I have printed the Wild River set and am very happy with it. I would say they’re very similar except the normal river set doesn’t have texture or details (like stones and bushes).
The River would be good if you wanted to add your own texture and detailing to the river banks, where as the Wild River is good if you prefer to have the texture already modelled on there.