I've seen the teethmarks Thomas Edison planted into the wood casement of his developing phonograph to "listen" for signs of vibrations emitted, traveling from his teeth to his auditory nerve via the bones of his skull and incus.
You know your voice sounds "different" to you when you hear it on a home video. Everyone says to you "No, that's how you sound when you speak." A mass of your voice vibrations enriched by your sinus cavities travel inside directly to your auditory nerves completely bypassing your ear, located behind the mouth.
So, with our ears behind our trumpet bell, and the trumpet frequencies vibrating through our skull bones directly to the auditory nerve, does the trumpet one is playing actually sound like the one everybody hears?