I have no problem saying that these three pictures are of the same man.
Incidentally, here is a younger picture of Herb.
And here is an even younger picture of Herb. That is Herb on the right. Frankie is on the left. Frankie passed away at the age of six.
Herb had a son, Glenn Willis Armstrong. Glenn Willis died at the age of seven. His first wife, Eleanor Forte, passed away in 1934. Herb remarried in 1957. He retired to the Ozark Mountains in southern Missouri, where he died in 1980 at the age of 88.