English term (edited): blind / blank

These terms are already in the glossary, and if you try a term search, you might well find some other alternatives that fit your context better.
It's hard to be sure without knowing exactly how the terms are being used in context — but these are general industrial terms. Note too that it is not obvious from your context whether the writer is seeking to describe 2 different items, or simply giving 2 common names for the same item — either is possible.

Proposé