Edit > Select Similar

When in component mode, Select Similar selects polygonal components (vertices, edges, and faces) of a similar type to the current selection. When in object mode, this option selects other objects of the same node type in the scene. Select Similar is useful when modeling non-organic objects that have many similar face angles and areas.

Edit > Select Similar >

Similarity Tolerance: Controls how similar components must be to those in the current selection in order to be selected. Select Similar evaluates each component based on its shape/orientation in relation to its neighbors. The value is set to 0.001 by default. A higher Similarity Tolerance setting selects more components.
NoteSimilarity Tolerance only applies to component selections.

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