No. When two of your matches’ DNA segments share exact start and stop points, it is not more significant than when they simply overlap. There are two reasons for this. Both are due to current limitations of microarray chip technology.
First, current microarray chip technology provides a sampling of your autosomal genome. There are many data-points (base pairs) in between each point tested. The true start and stop points might be anywhere between the matching and non-matching SNPs (single nucleotide polymorphisms) that mark the beginning and end of a match.
Second, because we use SNP sets of about 100 SNPs for Family Finder matching, the matching may actually begin or end at any point in the SNP block, respectively, before or after the start and stop points.