Konnected alarm pro install

I set up a 6 zone Konnexted board on top of a vista 20p several years ago. I initially ran it with SmartThings, but later added it to home assistant, which I use for automation. I kind of lost interest in the alarm and just used the 20p as a noise box inside the house, but I want to get back into the swing of it, so I was planning to remove the 20p and the old Konnected board and get two Alarm Panel Pros to the hard wired sensors.

My questions are:

Do I need to delete the old panel in Home Assistant, or can I just physically remove it and HA will know it is gone?

I am a low level user of HA, but have experience with it using the GUI - I never get into YAML. Am I going over my head using HA for the Konnected alarm?