Difference in LUFS between Logic and Audacity?

I have a track which shows an integrated LUFS across the whole thing of almost exactly -23 on the Loudness Meter, which is my target EBU level.

However, when I put the same track through Audacity with a target of -23 the resultant file comes out with a much lower level, about 3db less?

Has anyone else experienced this? Which one should I trust, Logic or Audacity?!
 
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