It's not really possible to make a direct comparison, given that a big chunk of the features are baked into the silicon, or are architecture-level choices.

It’s technically possible, but it would be difficult and likely require breaching an NDA. A bit pedantic, perhaps, but it’s out there.

Apple makes available on a highly controlled basis iPhones which permit the user to disable “virtually all” of the security features. They’re available only to vetted security researchers who apply for one, often under some kind of sponsorship, and they’re designed to obviously announce what they are. For example they are engraved on the sides with “Confidential and Proprietary. Property of Apple”.

They’re loaned, not sold or given, remain Apple’s property, and are provided on a 12-month (optionally renewable) basis. You have to apply and be selected by Apple to receive one, and you have to agree to some (understandable but) onerous requirements laid out in an legal agreement.

I expect that if you were to interrogate these iPhones they would report that the CPU fuse state isn’t “Production” like the models that are sold.

They refer to these iPhones as Security Research Devices, or SRDs.