I do not think that they should be merged. If you work you way up the line you will notice that the fathers and mothers are different.
I think the dates should be researched on Hardy-1368 because the following warning applies
Warning: Check the data.
- A child's birth date (Hardy-1368 born 1670) should not be before a parent is six years old (father Hardy-932 born 7 Oct 1665) .