It really depends. When you export RV3 points to CSV, there is no attribute that describes the datum. So if you import the points in QGIS, you absolutely need to specify the CRS correctly. This is a common issue in GIS: people confuse defining the CRS with reprojecting/transforming the data. The former leaves the coordinates unchanged and only states in which CRS they are while the latter will modify the coordinate values from a source CRS to a target CRS.
If you imported NAD83 points in QGIS but told it it’s WGS84, the software wouldn’t know to do anything with it. It trusts the info you’re feeding it. No transformation would happen then. The correct way to do it would be to import as NAD83, then export as WGS84 or use a geoprocessing tool to transform.
I don’t know what your pipeline is exactly but you might be making the exact same error with all your data so it ends up matching anyway.