Yes. Being congruent is part of the definition of an isometry.
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Dilation - the image created is not congruent to the pre-image
Isometry
Because the image is not the same size as the preimage. To do a dilation all you do is make the image smaller or larger than it was before.
An isometry is a transformation in which the original figure and its image are congruent. Shape remains constant as size increases.
An enlargement transformation