Force Touch was the same tech as 3D Touch, first introduced on the watch. It was rebranded for the iPhone when the pressure sensitivity stuff was added.
"Both 3D Touch and Haptic Touch fall under the umbrella of Force Touch functionality. This is Apple's general name for its technology that lets input devices distinguish between different levels of pressure when you touch them."
Force Touch was the same tech as 3D Touch, first introduced on the watch. It was rebranded for the iPhone when the pressure sensitivity stuff was added.
It's current replacement is Haptic Touch.