there's probably no way you are going to be able to match exactly what you have in the other rooms. Even if you found the exact product with the exact lot number, time/light would cause minor changes in the color so what's on your floor wouldn't match with what's in the box anymore. Maybe go with something obviously different but coordinating or find something that is almost matching but do a border design in between areas. Something so that you're not seeing that they don't match.