Why reuse that VD1065 designation and not give any kind of indication that there are two versions of it?
I too think it wasn't a wise choice to reuse the destination, specially from a customer service standpoint.
I'm going out on a limb and say it was a marketing choice (a stupid one at that) so they could reuse almost the same name to keep the same brand/product recognition without too much promotional investment or marketing collateral changes.
Sometimes, companies do this if they have a lot of marketing collateral left over from the older model (my old job, we did this; we just added a "+"... lol), but the newer model is only slightly different. It's easier and cheaper to slap a sticker on a box, manual and quick start guides that has the number II than to dump it and redo all the manuals, boxes, and such; plus the associated costs of the reprints, translations, and internal quality control for the new marketing collateral pieces.
Those boxes are nice printed boxes and they aren't cheap, specially if they are high gloss using custom PANTONE inks with any other custom overlays, cut outs or plastic windows.