InfoPath Dev

I have an existing form library with a complex form I built. I want to use that exact same form in a new SharePoint List. Is there an easy way to transfer that InfoPath form over to be used as my List form?

Not that I know of. The form library form has a complex, but unlocked schema. The list form will have a flat schema, locked to the list's columns. If your form has even one repeating node, you'll run into a challenge converting into a list form.