The same feature is NOT available on non 3d touch. The behavior with long press in control center can also be done with long press on 3D-touch capable devices.It is now nothing more than savvy marketing to call the feature that is on the 6S and forward iPhones “3D Touch“ when the same functionality is now persistent on the 6 and older devices. No special screen is needed, no special processor is needed, same type of functionality can be emulated quite easily without all of that supposedly important hardware.
But Apple really should just have made 3D touch a shortcut to long press.