false
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That's not a postulate. It's a theorem. And you have stated it.
The SAS (Side-Angle-Side) postulate.
Only if the congruent angle is the angle between the two congruent sides (SAS postulate).
similar
When all of their corresponding angles are congruent (in any triangle, in fact) then the triangles are similar. Similarity postulate AAA. (angle-angle-angle)