Engine/p≡p vs OpenPGP

Nomenclature of p≡p and OpenPGP are not identical. Especially the following terms are used very differently:

p≡p OpenPGP comments
user_id (no concept) ID for a person, i.e. a contact
username + address uid comparable only for email
fpr fingerprint used as key ID in p≡p
(no concept) Key ID does not exist in p≡p