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Are these natural? Which one is more natural?

There are four or five other psychologists who work here, but they're never here this late.

There are four or five other psychologists working here, but they're never here this late.

And would this have a similar meaning:

There are four or five other psychologists who work/working here, but they're never here at this time.

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Are these natural? Yes. Which one is more natural? There's no real difference.

There are four or five other psychologists who work here, but they're never here this late.

There are four or five other psychologists working here, but they're never here this late.

And would this have a similar meaning: Yes

There are four or five other psychologists who work/working here, but they're never here at this time.