A few years ago, we changed from painting these top covers to powder coating them. This change took place long enough ago that it's safe to assume that all the tops referenced here are powder coated...
The earlier powder coated tops had a somewhat rougher finish, while the current version is relatively smooth, although still much less smooth than any of the painted tops.
I'm going to assume that the BDA2 with the rougher top had one of the early powder coated tops installed, while the other two units used the newer smoother top. The nature of the powder coating process means that slight variations in finish can be expected, but I had a quick look at the tops we have in stock, and the finish is very consistent. I think you are safe to assume that a current production BDP2 will have the same finish as your BHA1 and BDA2.
Thanks,
Mike