In QGIS I have two vector layer shapefiles which should overlay approximately one on the other. They have both been downloaded from the same government website (data.vic.gov.au) with the same projection (GDA94 Zone 55). When loaded into QGIS they show the same CRS (EPSG:28355) which is also the project CRS, "on the fly" projection is on, the content of their .prj and .qpj files is identical. However when loaded they appear on the screen many kilometres apart.
What is going on?