Its the same but since the meters are quite different it's hard to compare. The meter in the arranger view is very "course" and a bit generic IMO, while the meter in the mixer view is a bit more "detailed" so to speak. Especially if expanded in the undocked view.
Either way, if you really want to get into precise metering, you will want to explore third party options. Based on the nature of your question though, it is probably purely optional. I'm a measurement guy with a collection of micrometers etc in my toolbox(es).