A: No. iOS and iPadOS use a completely different version (GarageBand for iOS, currently 2.3.15+). The 10.x numbering is exclusive to macOS.
This is a common Mac error for older software. Open Terminal and paste the following command, then press Enter: sudo spctl --master-disable Then re-download from the App Store. Once installed, re-enable Gatekeeper: sudo spctl --master-enable Garageband 10.4.1 Download