Success!
I completed the transition from my old Intel N100 WIn11 Pro system to my new AMD Ryzen 5 5500U system last night. Thanks to everyone here who provided guidance - I'm sure I would have been far more nervous without all that input. The new system is running A-OK now, even though there are a couple of tweaks yet to be made. Here are the key steps I took to make the transition:
1. Complete the installation of Win11 Pro on the new Ryzen system. This was far easier than I expected because it never asked to create a Microsoft account; Instead it came up with a Local account only. My guess is the Win11 Pro that was installed on the new machine was tweaked (Rufus?) to do that. The PC manufacturer is a Chinese company named BeeLink, so of course they can do whatever they want.
2. Install Macrium Backup on the Ryzen system and make disk image backup of the Ryzen boot drive. This was insurance in case I messed something up that resulted in an unbootable system.
3. Restore my latest N100 Macrium backup to the Ryzen system. The restore took about half the time the N100 required to make it.
4. Boot the Ryzen system. It first came up with some messages about updating hardware drivers. Then it rebooted to the standard Windows startup screen. I figured I was home free at that point because my N100 system has a Junction Link that puts all Temp files on a second hard drive that I hadn't installed yet. But Win 11 booted fine without it.
5. I wasn't home free. My working configuration has 2 monitors, the primary is in Landscape mode and the secondary in Portrait mode. I also have a wireless lighted keyboard and a wireless trackball. Bothe of these use Bluetooth to connect.
When I hooked up the Ryzen to all this the boot screen was on the Portrait monitor, so everything was oriented 90 degrees from horizontal. My keyboard worked, but the trackball did not - I had no mouse action at all. I fixed this by installing the Bluetooth dongle for the trackball, which I had not needed on the N100 system. (Both PC's have built-in Bluetooth support.) So I still have a bit of work to sort this out.
6. I could not get the system to recognize what was my Primary monitor. So I rotated the secondary enough to read text without breaking my neck. Then all of a sudden, with no warning or message, the Primary monitor came on and I was able to get both monitors working OK using the standard dual monitor option.
7. I had to do some extra work getting my second hard drive working. Basically the N100 has a slot for a PCIE SSD card, but the Ryzen does not. Instead it has an internal space for a standard SSD hard drive, so I mucked about transferring everything from the PCIE card to an unused SSD drive I had lying about. That is working fine in the Ryzen now.
8. With everything working OK I noticed the following oddities: all my animated cursors were gone and replaced by the standard Windows ones. Also, the system colors were totally different, and my fixed image screensaver was replaced with one of the stock Windows ones. These 3 issues were easy to fix using the standard Personalization screen.
So I'm a pretty happy camper now - and thanks again to everyone who helped me do this. I'm happy to answer any questions anyone might have.