I can switch back and forth between Voxel and, say, Fluent and each will work independently.
Yes just don't set it to default when you are developing the site, as the others will see the new site. I suggest making a new menu and setting that menu to admin access and assign everything in there and testing it and when you are satisfied just set it to default and thats it. I would suggest you make a test of this on your local machine or somewhere online in a subfolder and see how it behaves.
Correct if you use the same names for individual position they will work fine.
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