No. Review the actual process and relevant admission or status records. Different documents may establish different parts of the applicant’s immigration position.
Read the documents together
Identify what the approval covers and what the applicant’s actual records show. Do not assume the longest date appearing anywhere authorizes work or stay until that date. Have any uncertainty assessed before relying on it.
A useful test is to ask what would change if the approval notice did not exist. Admission would still have to be granted, a period of stay would still have to be recorded, and the work would still have to match the classification; the notice removes none of those. That is why the longest date visible anywhere in the file is the wrong thing to rely on.
Where records disagree, decide which of two situations applies. Either one record governs the question at hand and the others are context, in which case act on it and note the discrepancy, or no record clearly governs, in which case the answer must be obtained rather than selected. The second situation is more common than people expect, and treating it as the first is what produces an unauthorized period nobody intended.
Note also an outer limit that no single document displays: L-1A stay is generally subject to a seven-year maximum.