My knowledge of geospatial sets is fairly shallow, but I’ve worked a bit with Australian map data and I’m assuming are you referring to the different CRSs, GDA

My knowledge of geospatial sets is fairly shallow, but I’ve worked a bit with Australian map data and I’m assuming are you referring to the different CRSs, GDA2020 and GDA1994? I’d imagine older coordinates would work with the earlier CRS? But I can understand not all coordinates specify their CRS. This have really been an issue for me personally, but I’ve mostly worked with NSW spatial and the Australian Bureau of statistics geodata.