My Salewa Wild Fire GTX fit true to size. 10.5 street equaled 10.5 approach. Downsize a half size if you want more of a climbing shoe fit. Mine are slightly snug with a wool sock.
Not sure if it's too late to be helpful, but I have a 10.5-ish street size and I wear the Wildfire Pro in a 10 and the Guide Tennie in a 9.5. They fit about the same in length, but the Guide Tennies are wider. I would size down a half size from street for Salewa approach shoes.