You asked about "Public Key" and then you linked to "Address"?
The address and public key are not the same, but if they match; it is a fact.
We assume that we have created a "cold wallet" (Paper).
We are going to import the public key and the private key to Armory or Electrum.
How many digits (+ -) can a public key have?
"Can have" in usual format.
How many digits (+ -) can a private key have?
"Can have" in usual format.