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A triangle has 6 parts ... 3 sides and 3 angles. It's possible for two triangles to have as many as 3 of their parts congruent, and the triangles still not be congruent.
'corresponding parts of congruent triangles are congruent'
Equilateral triangles have three congruent sides and three congruent angles
CPCTC is an acronym for the phrase 'corresponding parts of congruent triangles are congruent' It means that once we know that two triangles are congruent, we know that all corresponding sides and angles are congruent.
A polyhedron with two congruent triangles. There are very many possible configurations.