Assuming that you mena this sort of congruence

"In geometry, two sets of points are called congruent if, and only if, one can be transformed into the other by an isometry, i.e., a combination of translations, rotations and reflections. Less formally, two figures are congruent if they have the same shape and size, but are in different positions (for instance one may be rotated, flipped, or simply placed somewhere else)."

(copied from Wiki)

then no, they are not all congruent.

If you were alowed to pick one up off the plane and project it then I think they would be but I'd not know where to start on proving it.