It is true that there is a small overlap with program-options, but the rest of the library (the majority of the library) doesn't have anything to do with Program Options AFAICT.
What is the basis for your opinion? IMO it's 1:1 correspondence. Could you do feature by feature comparison?
Could you?
AFAICT, just readon the tutorial for Program Options vs Reading the docs for Command Parsing with the property-tree doesn't show much overlap. Program options is much more advanced and formats messages for you and all. The property tree gives you a something like a map from arguments to argument values.
I believe Storate component of PO and property_tree in this submission are the one that overlaping. Then each library present different parsers for different formats to populate this storage. But most importantly: the problem domains are the one that are overlaping. Unless you want ot amend the problem domain for this submission. Gennadiy