An interesting difference between your photos and the renditions linked here is that the buildings in yours are black silhouettes, while the ones here are fairly well lit up. That's the first thing that stuck out at me: if there is no light pollution, what is lighting the foreground buildings? If you look at the Hong Kong photo, for example, it looks like there is a ton of light pollution: all the buildings, plus the surface of the water in the harbor, are lit by a diffuse glow. The only exception is the sky, which is inexplicably not affected by the same glow, clearly giving away the Photoshopping.
Perhaps there's some combination of moon-lit conditions that would produce that effect, but it sure doesn't look right to me.
To get the kind of starry skies shown in those pictures, you'd need an exposure of at least tens of seconds if not more. With that long an exposure, the starlight will be quite sufficient to bring out detail in the environment.
Perhaps there's some combination of moon-lit conditions that would produce that effect, but it sure doesn't look right to me.