It can be called anything, depending on what it actually is.
But it's described as 'congruent' to the first one.
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symmetrical shapes
Two objects having both the same size and shaped could be said to be 'congruent'.
It is said to be 'similar'
Having the same size and shape means that you look the same height and size.
The definition of equivalent is something that is ... having the same valence; Geom. equal in area, volume, etc., but not of the same shape.