The least amount of information needed to establish congruence is; Angles M and M' are congruent, and angles N and N' are congruent.
If follows from concept of congruence that two triangles are congruent only if all three angle measures are congruent or all corresponding sides are in the same ratio.
Hence, when angles M, N and M', N' are established as congruent, it follows that the measures are equal respectively.
Ultimately, the measure of angles L and L' are equal and hence, all three angles are congruent in each triangle.
Therefore, the least amount of information needed is; Angles M and M' are congruent, and angles N and N' are congruent.
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