Similarities between Cupas and the Jersey Devil?

Here's what I've figured out. I haven't done too much research on Chupas yet, but I know the Jersey Devil pretty well as I used to live in Jersey (horrible place it was) and heard about it all the time.

*Both have wings (some chupa reports report wings, most don't though)
*Both feed on livestock occasionally, though the JD seems more interested in stealing or mangeling them rather than draining blood.
*Both creatures seem to be similar in size based on reports.
*Both have similar habits of disappearing when seen.

Other stuff seems similar too but I'd have a hard time putting it into words and I don't have hours to type right now.
What are your thoughts???

Eh, they're completely different creatures...completely different myths.

They are two different myths but you can also add a third myth to these, the one of the Thunderbird. Maybe they are all types of flying reptiles related to the Pterodons of long ago. There are sightings of these things all over the world, carniverous flying monsters that have leathery wings and strange heads. They are in Africa, PA, NJ, NY, an the Southwest US. I am sure especially in the tropical environment of South and Central America that remnant populations of these things could exist.