Will an iPhone 6s Plus case fit an iPhone 8 Plus?

I currently have an iPhone 6s Plus and I have a lot of cases for it, I just ordered an iPhone 8 Plus from apple.com but i'm worried the cases won't fit my new phone, will it fit or not?

I went from 6s plus to 8 plus about two months ago. My old lifeproof case did technically fit my 8 plus but not perfectly. My old case partially covered the back camera lens and adjusting volume or using power button with old case on new phone was a bit awkward. I ended up buying a new case for the 8 plus.