There are at least 5 players in the 1914 set that were later changed in the 1915 set:

#48 Harry Lord
#60 Rollie Zeider
#62 Jay Cashion
#99 Frank Chance
#111 Jim Callahan

Also, some of the team names differ for each player on the 1914 and 1915 sets. They can be easily distinguished from one another by the card backs and are not the same sets.