At the end of the day these autopsy photos were supposed to be locked away so that none of us could ever see them but I believe it was Groden who for financial gain smuggled them out, so their authenticity must be genuine but is there any way for us to be absolutely certain, yes there is!
Back when the autopsy photos were taken in 1963 right up until the smuggling by Groden there was virtually no way to fake genuine stereoscopic photos, these type of photos exposed slightly horizontally to the left or right of each other mimic human eyes and enable us to recombine and create stereoscopic images but since a lot of people don't have access to the hardware to enable viewing of stereo images these depth mapped morphs which rely on millions of pixels to be precisely the relative same distance from each respective position of the camera are a satisfactory 2D representation, so in a nutshell when recombined every pixel is at the relative same depth and creates perfect rotation.
The only hole on the back of Kennedy's head was the size of a bullet hole.
The injury on the side of the head is a perfect match to the authentic Zapruder film.
JohnM