Packages from different app stores will have different signatures. You need to update from the same source you installed from.
Android App Developers - I have a question. I don't use Google PlayStore much, I prefer F-Droid or Amazon Aurora. If I install an app from F-Droid or maybe via direct download, and then Aurora says it is out of date and downloads it, sometimes it cannot install and says "Conflicting package exists". Why is this and how should I handle this? This happens with Amythest and Primal at least. nostr:npub1gcxzte5zlkncx26j68ez60fzkvtkm9e0vrwdcvsjakxf9mu9qewqlfnj5z nostr:npub12vkcxr0luzwp8e673v29eqjhrr7p9vqq8asav85swaepclllj09sylpugg