Is the iPhone 8 home button backwards compatible?

I fix phones for a living. I ordered two buttons for a couple of clients (iPhone 8 and iPhone 7) at the same time. Then I found out that the iPhone 8 button would not be replaceable by myself. (Thanks, Apple!) So I sent the iPhone 8 button back to where I ordered it and got a refund. Or so I though. It turns out that I sent the iPhone 7 button back by mistake and now I'm left with an iPhone 8 button that has to be fitted to an iPhone 7. It this possible. I've looked at iPhone 8 buttons online and they look no different from the 7's. Can I just use the 8 button in the 7 and not waste any more of my clients time by ordering a new 7 button?