If I understand what you are trying to accomplish, this can easily be done by deleting one Hero_HTTP skeleton from one folder and replacing it (when prompted in the window that will pop up) with the other Hero_HTTP skeleton since they are identical. Now both ThirdPersonAnimations and the animations from the Animation Starter Pack will work for both the FirstPersonCharacter and ASP_Character, regardless of which one you have set as the pawn in the Gamemode Blueprint.
*Note: there is currently a bug where the animations will “dip” below ground level when blending between these animations. So, until this corrected, you might want to stick to one animation set or the other.