Looks like the difference with the Ernie Lombardi is they added text (an additional sentence) for the 1939 version.
For other differences one needs to have access to the actual cards or another source that has more images of the cards. This is one of the big problems trying to find differences for older vintage sets. Finding images and samples of the cards is more difficult.
I collect: Baseball, Football, Hockey, Mostly Vintage pre1980, My Homie teams - Washington/Baltimore Teams Senators (Twins, Rangers), Expos/Nationals, Redskins, Capitals, Bullets/Wizards - HOFers - Non-sport (mostly TV shows and movies).
My Trade List is very much a work in progress
CaptKirk42s Trading Card Blog Curly W Cards Strive For '65 YouTube klandersen42