Looks like the much older twin version, you ordered direct so they might be using up the old stock. Waste not want not. The single exhaust was to improve thrust. The visual checks are the compressor on the 12000 has ten blades and on the 14000 twelve. Also the opening diameter cross section is larger on later 14000 for more thrust.

Your engine number should indicate the very latest version but something isn't right here.

Paul