Russell W. Patterson schreef
I think they are of the same species but maybe one is male and other
female? That may be a stupid statement but I'm ignorant on this
subject.

+ + +
Hickories don't have separate male and female trees.
I suppose you have two species here.
Maybe 019 is Carya cordiformis, bitternut? (educated guess only)
Fruits would help, or buds
PvR