difference - Are "most" and "the most" the same?

(1) She says the U.N. does not have enough food for all of the refugees, so it helps those most at risk.

(2) Last year, U.N. agencies worked to establish who were the most at risk among all registered Syrian refugees.

How should I understand "most " in (1)sentence and "the most" in (2)sentence? Are they the same? Do they both modify the words at risk in the same way?