Actually CZ what you describe would be known as a pair in the trade. A matched pair would be ordering a gun,liking it, going back to the manufacturer and asking to have a second built " exactly" the same as the first, i.e. matching. A composed pair would be two guns built on separate occasions (possibly for different clients) which were subsequently bought together and every effort made to make them identical. Much a question of semantics but those are the terms used by the makers, definition and usage. may (will) become diluted outside the Gun trade.
