Could the dryer have been matched with BD washer?
I don't think so. The electronic controls on the BD models were not as centered on the console as the one in the photo above. Also if you look at the door handle you will notice it does not have the chrome-like framing around its outer edge. The Whirlpool dryers that matched belt drive washers had this until the end of BD production.
The washer is definitely DD. The width is narrower, also the lid is bigger than the BD lid, and although it is hard to tell, I think the handle is the one with the cut out in the lid well which is similar to Maytags. A BD would have had the same plastic handle as the dryer.
If I had to guess I would say these are 1987/1988 models.
Have a good one,
James