Hello David
I think there is probably some connection due to time, place and names. The farthest I have back for the Dow famly is Andrew born abt 1809 in Stirling who married Jane Baird born abt 1805 in Stirling. They had at least 5 children born in Larbert that I'm aware of, namely:
Alexander b abt 1839
Elizabeth b abt 1842
Mary b abt 1848
James b abt 1848
Agnes b abt 1855
I think it's possible that either Andrew b abt 1809 or Alexander b abt 1839 could be related to you Dow family.
We can keep working on it now that we know of more Dow famly members from Larbert.
Bob