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Michael is pointing at her and Karl, sending the too-tight-suited man hurrying over to them.

Michael is pointing at her and Karl, sending the too-tight-suited man hurrying to them.

what is the difference in meaning?

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No difference.

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"over" can be added to verbs of motion to focus on the fact that someone is moving through a distance.

"over" is almost always an unnecessary extra word between a verb of motion and the preposition "to".

We show them hospitality whenever they come over to our place to visit.
Run over to the 7-Eleven and see if they have any cookies.
They went over to the casino to do some gambling.

CJ