Public Service Message:
The one on the right comes from the UK but can be found in many good grocery stores in California. The contents is a dark brown and has a consistency of soft honey. They get points for the cool jar but I reserve the right to deduct the points for fooling people into thinking that it actually contains real Marmite.
The one on the left comes from New Zealand, and can't be found anywhere except there. The contents is as dark brown as you can get without being described as "black", and has the consistency of used axle grease, or some kind of ointment. It is the real stuff.
Ideally it should be stored in a tin in the garage and applied to toast with the back side of a putty knife.