They probably used whatever brand or supplier was giving them the best price at that moment. Bad part about that is they probably changed suppliers every year or two at the least. Then you add in the fact that a lot of manufacturers have either gone out of business or have been purchased by other and larger companies and the end result is you probably have approx a 2% chance of getting siding to match. Then even if the siding is the exact match to what was originally installed after 10 or 11 years the color match will not even be close from sun fading.