They are said to be congruent to each other
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equal, the same as, mathmatically similar, exactly the same as each other etc. The technical term for figures of identical size and shape is "isomorphic".
Two figures with the same size and shape called congruent.
They are congruent. Figures that only have the same size or only have the same shape as each other are "similar".
these figures are called similar
They are said to be similar figures.