Yup, they are different… The things you learn as a JDM newb.
US license plates are 6in X 12in vs. a JDM plate coming in at 6.5in X 13in. And you thought everything was bigger in Texas.
Sorry about your luck, that US plate won’t mount without some duct tape! Want the easy fix… buy this and get it shipped fast and mount your actual US license place without having to mess up the factory mounting point.
The plate adapter we have used without issue: https://a.co/d/8Uivwg7