Its your PPOR anyway mate, so it's not that big a deal if you over paid, as long as you love the place and will be happy to live there for some time.
Doubt that simtr, imagine you purchase 700k. Bank val is 650k, then next year market slow down. The same house around 600k.
You not only lose the money on paper, but time and opportunity to reinvest the equity
Regardless its ppor or ip, you make money when you buy.