I’m not very familiar with a 414 but some of these Cessna medium size twins have complex fuel systems.
Inboard/outboard tanks, some tip tanks and some with nacelle tanks. Fuel returning to a different tank then it came from and all different capacities.
STC’s can make one plane significantly different from another.
Transfer pumps that transfer at a rate which is less then the engine fuel consumption at a high power setting so yes it’s possible to starve both engines of fuel while you have plenty on board.