The key layout on the calculator (DA or desk accessory) exactly matches the numeric keypad of the Lisa keyboard, but the big '=' key is labelled 'Enter' on the physical keypad. You could use the keypad to use the calculator, which I remember doing on a "Macintosh XL" (a Lisa running Mac OS) Having the big key be '=' was a nice usability feature since 'Enter' didn't make much sense in the calculator DA.
If you search for pictures of "Original Lisa Keyboard" you can see that the layout is the same. However, in the pictures I found the key that corresponds to the small '=' in the screenshot in the article is labelled '-' and there appear to be some other differences. I don't remember these differences or any rationale for them.
Update: They screenshot in the article exactly matches the Macintosh Plus keyboard -- which is a keyboard I actually owned. Although I used Mac XL before getting my Plus, it's probably this keyboard that I'm remembering:
It’s odd because the original Macintosh had a smaller keyboard without a numpad, however one was offered separately. It’s interesting because this “original” keypad has different placement or operator keys than the Plus keyboard.
If you search for pictures of "Original Lisa Keyboard" you can see that the layout is the same. However, in the pictures I found the key that corresponds to the small '=' in the screenshot in the article is labelled '-' and there appear to be some other differences. I don't remember these differences or any rationale for them.
Update: They screenshot in the article exactly matches the Macintosh Plus keyboard -- which is a keyboard I actually owned. Although I used Mac XL before getting my Plus, it's probably this keyboard that I'm remembering:
https://en.wikipedia.org/wiki/Apple_keyboards#Macintosh_Plus...