I've seen this answered in various places on the web, but have seen some conflicting opinions.

Basically will a Series 3 bonnet fit a Series 2 car.?

Mostly I have seen people say yes, but a few comment on different hinges. Any comments here?

 

Yes, here is my 1974 SII with a S3 Sovereign hood/bonnet leaving my house for the last time. I like the new grill much better than the original type.

The front fenders from the Sovereign are inside the car as the poor thing came from Colorado and had lots of front end and floor rust.