Part1: Clean installation of macOS Catalina
1. Download macOS Catalina installer from Mac App Store
2. Put NMVE SSD in an enclosure
3. Erase NVME SSD and run macOS installer
4. Swap the internal SSD after system reboots
Part2: Clone macOS from original Apple SSD
1. Download macOS Catalina installer from Mac App Store
2. Put NMVE SSD in an enclosure
3. Create a USB macOS installer
4. Boot from the USB installer
5. Run disk utility and restore from original SSD
6. Swap the internal SSD after data transfer completes
macOS Install Disk Creator can be download from here:
[ Ссылка ]
