I think you will come up short on this question as info on the 65 Cadillacs Part to make a comparison is not available on this site as we cover the 63-64 Cadillac year info here in very much detail
If you have nothing to contribute....why respond
I responded because what I I had to contribute was my opinion on the subject you asked about knowing the info available on this site
Seems you got real lucky with Maurice having the info you asked about from his experience
Enjoy and Stay safe
If you need a 64 hood emblem, I have a NOS piece. email me at firstname.lastname@example.org
I looked at the parts again, and I believe it is a repop part. There are no numbers on the back side.
The parts catalogue lists them as different #s. I have owned both years and the hood on the 65-6 where the crest mounts is pointed compared to the 63-4 area which is more flat.
Thanks Maurice,that was my suspicion...