Personally, I wouldn’t take that chance. Even if the ingredients are identical to the pet version, you don’t know that the amounts of each ingredients are the same and low enough to be safe for cats. Can’t you just take the bottle back and exchange it?
I would personally exchange it for the pet version. I don't know how or why the stuff works, but it's a miracle for my cat and dog. The 4th of July is far less stressful for everyone with this stuff!