Thank you very much @alankilian . This is a huge help.
Your answer actually highlights one of my difficulties...
The NTC thermistor you provided has Beta values indicated on its product page of (4066 K, 4036 K, 4085 K), and the datasheet has them as (4072, 4036, 4092) and the product page values aren't even represented in the datasheet.
M308 commands in your config.g set the thermistor Beta value as 4385. I am not saying that it isn't correct, but I don't yet know how to determine how to setup these thermistors for the Duet firmware. BTW - I am currently using v3.2.2.
The other value I don't get is the T100000 - shouldn't that be T104000?
How did you determine the C value for the bed thermistor?
Thank you again, Karl