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Two triangles are congruent when all three pairs of corresponding sides are equal (SSS), which forces the angles to match as well. If the sides are in a constant ratio other than 1, the triangles are similar rather than congruent.
SSS congruence
a₁ = a₂, b₁ = b₂, c₁ = c₂ (after sorting) ⇒ congruent
No. The sides are sorted before comparison, so any ordering of the same three lengths is recognised.
No. Side-side-angle is ambiguous and can describe two different triangles, which is why it is excluded.