When something is, for example, accepted before the next point is mentioned, we may use either "Having said that..." or "That (being) said...", where "being" is optional.
The difference in meaning is practically the same, but their use however needs some caution. The latter can be followed by any subject in a sentence with which it starts, whereas if you start a sentence with the former, you will then have to make sure that the following subject relates to the speaker of the expression.
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