Two kinds of HP-41 Blanknuts?

[Joe Horn]

AFAIK, the HP-41 "Option 001" (AKA "Blanknut") was internally a 41C, never a CV or CX. But some photos of Blanknuts have the 41C's silver border around the keyboard, and some have the gold CV/CX border. So ... are there two different versions of the Blanknut (other than the color of the keyboard border!), and if so, what are their differences? My searches have come up empty. Thanks in advance either for an answer or for a pointer to an answer.