Matched pair, true pair and composed pair mean different things to different people. I consider a “true pair” to be one which are consecutive serial numbers, built together, to the same specs and finish levels. Everything else, to me is just a “pair”. They can be a second gun built to copy a earlier first gun or two similar guns which have been bought separately and have been made as much alike as possible. With enough money and skill they can even approach the “true pair” in fit, finish and feel. In the end I don’t think it matters that much if well done.