What does two things exactly alike?

Two things that are exactly alike share the same characteristics, properties, and attributes, making them indistinguishable from one another in all relevant aspects. They may be identical in shape, size, color, function, and any other measurable criteria. In essence, they are perfect replicas of each other, often referred to as duplicates or clones. This concept is fundamental in various fields, including science, philosophy, and art, where distinctions between entities can have significant implications.