Model Units change question

When I open the Revit model and Rhino.Inside and after some time will change Revit unit from m to mm I got this message. This all correct.

My question is do I need to go to rhino and change Units to Meters or I must save Revit in Meters and open again project in meter so Rhino will also be in the same units. Are both option safe?

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Yes is safe to keep working with the units you like.
It is just a reminder that ‘1000’ in Grasshopper means ‘1’ in Revit.