The strapless edge on a navy dress curves across the front below the shoulders. Draping crosses the upper area while visible lines lead towards the waist. Its dark and relatively quiet overall appearance may feel related to the burgundy reference at first glance. Coverage is clearly different, however: the neck and shoulders remain open here. Assess colour and upper edge as separate decisions if you bring both photographs into a fitting discussion, rather than treating a dark silhouette as one fixed type of neckline.
A necklace sits against the open skin area in the pictured outfit. On the high-neck comparison, that same region would be occupied by the dress. Actually try the position of your own jewellery rather than assuming it transfers unchanged. The photograph reveals neither the internal support of the strapless bodice nor how it sits during movement; ask to inspect those features on the garment. The leg opening and long lower hem are additional details, unrelated to neckline height. Set them aside initially so you can decide clearly whether you want this open upper line.