Let's try this again:
3D Touch adds multiple actions based on pressure. All set there. No argument.
Faux 3D Touch Long Press can also add multiple actions, but not based on pressure. Based on flyout menu content. For example, if a Faux 3D Long Press on iMessage brought up the same submenu found on the real 3D Touch with the addition of "move app" and "delete app", you wind up in the same place. I can send a quick text without opening iMessage, I can move apps, I can delete apps.
Functionally, the same thing (get to underlying functions quickly without launching app). Technically different (one is pressure based, the other is menu based). Different ways to scoop it, but same ice cream.