please

[spare mango]

I guess he just looked at them and decided they are not congruent

instead of applying standard tests for congruency

[junior pollen]

I think Charlie thought that congruency must also mean preserved orientation (so, no rotations ore reflections are allowed).

That's not correct, of course. You can rotate and reflect however you want.
As long as the scale and the shape of two bodies is the same, they are congruent.

[spare mango]

well your choice of words was way better than mine

[charred grove]

Ty