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The difference between a moving and a static scene is surprisingly small: in one case you render a slightly different scene every frame, and in the other you re-render the same scene every frame. But the pipeline is set up the same, with the same shaders, the same rendering passes, etc.

So, in practice, if they are noticeably different in the dynamic case, you'll see those differences in the "as if it were dynamic" case, which is most graphics demos of this sort.

No, but quite a few people who are familiar with OpenGL are interested in learning Vulkan, and it's really educational to have a side-by-side comparison of the same scene.

Visually, no - it should look the same. For comparison of the code, it will be interesting, even if it doesn't necessarily show everything you can do with Vulkan and DirectX (which has some similar low-level features in recent/latest? version).