If you think buying a C172 with an O/IO-360 in it means you have some highly scientifically special genuine Lycoming piston in it you are in for a shock.
No, but if you look at an exhaust valve from a Jabiru engine and compare it to a 0-320 you might be in for more of a shock. Compare shaft diameters, note the head and tip welded on the Jab. Even Don from Jabiru commented that should a Jabiru valve get a bit of lead stopping it from seating correctly the head could burn off in about 15 minutes!