Itโs actually the A321-200. The lengthy fuselage is the trait that distinguishes it from the rest of the family.
Not necessarily. Some CEOs have the sharklets after slight adjustments for fuel burn. That one in the image has wingtip fences. All NEOs have sharklets. Also, the CFM56 engines give away that itโs a CEO.
Donโt worry, I used to think that the a321neo and a321nx were completely different models (Not to mention I didnโt even know the differences between the 737 and a320 families but still named myself an โavgeekโ lol)