First the hypothetical, but the opinions I seek must be applied to two different contexts.
Hypo #1: You click a photo of scene (Image 1). You re-arrange your strobes and click again (Image 2). You come back to the spot later in the dive and take almost the same shot (Image 3). You come back to spot and take almost the same shot on a subsequent dive (Image 4). You come back to the site and take the same image the next day (Image 5). You come back to the site the following year and take a similar shot (Image 6).
Are these images different? (wait for context)
Hypo #2: You are snorkeling at the surface. A whale comes swimming by. You fire in continuous mode. You get 20-30 shots in a sequence. Any 2 or 3 look very similar, but shot 1 and shot 30 are very different due to the whales relative change in position.
Are each of shots different? (wait for context)
Context A: You license one of your images. Someone wants to license one of the other snaps of the shutter. Can you do this, or are Images 1 to 6 in Hypo #1 too similar or images 1-30 in Hypo #2. Since it involves licensing and copyright, there may be a more bright line answer for this context. I just don't know what it is.
Context B: You want to enter an image for a photo contest. Rules state you can't enter an image that has placed in a previous contest. Are the hypothetical clicks of the shutter creating different images, or are the same image in the context of "sameness" for the photo contest rules. If the answer is "they are the same", what would the criteria be to cross the line of being different?
I recently saw a contest winner that I had seen before. It placed several years ago in a contest category that I had also placed in. I would guess it was a flat out violation of the rules, but it could have been the second "snap" of the shutter release on the same dive.