BEV Inspire has the same source images as basemap Ortho, namely Geoimage, it only gets updated earlier. So most of the time it's the same and when they differ BEV Inspire is newer. The images are usually updated every 3 years, although this area here seems to deviate a little from the usual pattern as the latest data should be from 2023 and the watermarks on basemap Ortho show the year 2021. See here for more details: https://www.geoimage.at/metadaten.html