Found: Contemporary, romance, Dude Ranch setting being able to tell twins apart

I believe that this is a Jude Deveraux book.
The heroin ends up ata Jude Ranch and there is a rattle snake encounter at the very beginning. They set out on the trail and for some reason the trail leader doesn’t like her, when they are on the trail the twin brothers switch places and she knows that they aren’t the same person. Legend has it that only their true loves can tell the difference.
I believe she is an author and at the end of the book he lands on her roof or something like that. He is a millionaire/billionaire.
Any help would be greatly appreciated

That is a short story in The Invitation, Deveraux - Kane Taggert's story. Sweet Liar, Deveraux is his twin's story & comes before it.

Thank you so much!