Transferring Insteon devices from old Home Assistant Pi to new one

Configuration
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I have two Pi 4s running Home Assistant:

Old Assistant:
I can’t find it on the LAN anymore, not sure why. I don’t want to reboot it because I don’t know what will happen. I hooked up a monitor to it and it shows it claiming an IP address on startup, but it’s not at that address. My Insteon PLM is still plugged in to it and that system is still controlling some Insteon devices.

New Assistant:
I set this up because I was having problems with the older version. I still have a few things to finish on it, including the Insteon devices. No PLM in it at this point at all.

Insteon setup:
I have a few Insteon devices and I really do not want to remove them then add them, since one is a garage door opener that’s hard to get to (and high up!) and others need to have some light fixtures removed from walls or ceilings to get to the controller. I have the PLM plugged into a USB extender on my Pi with Home Assistant running. I also have a 2413S Powerline Modem plugged in about 4’ from the PLM. I have had trouble with the PLM, by itself, connecting to the Insteon devices, even ones that were close by. Once I added the 2413S, Home Assistant was able to communicate with my Insteon devices.

Goal:
In short, I want to pull the PLM out from the old system, plug it in the new one, add the Insteon integration, and have my current Insteon devices working with the new system. I’ve read that the Insteon devices are paired with the PLM, not with the software like Home Assistant. Since several devices are on timers, and, even with the old system not being easily found on my LAN, still being activated and controlled from the old system, I don’t want to pull the PLM out of that system until I have an upgrade path so I can be reasonably sure that I can transfer the PLM to the new system and start controlling the Insteon devices.

I understand this may not be possible and I’ll have to go through and reset my Insteon controllers by hand (since I can’t remove them from the old system when I can’t connect to it), but if I remember correctly, that the devices pair to the PLM and not the software, I would think a changeover would be possible.

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When I couldn’t get an answer for any of these issues here, on the Home Assistant forum, I started thinking, “It looks like I might have to remove and re-add everything. As long as I have to do that, it’s like starting over from scratch. Maybe it’s time to re-evaluate my system.” I started looking into openHAB. While I’m not sure whether I’m going to change over or stick with HA, I did ask a number of “I’m thinking of switching” questions in a thread there and it includes my question if whether the devices stay with the PLM or not and I did get answers there, on this thread.

So there is an answer to this, it’s on another forum.

Still not sure about which direction I’m going to go.