Just trying with surfaces. Different Profile orientation was selected from options but differences are not clear enough.
Are you able to pinpoint the differences?
With Follow Path, the profile will follow the path and turn with it.
Using Keep Normal Constant, the profile is still swept along the path but will not turn with the path, therefore the normal of the original sketch is maintained throughout.
See the image below for how this would look if a circle was swept along a path circular path with:
Top - follow path
Bottom - keep normal constant
If you design them so they overlay and color them differently, the differences become much easier to find...
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