I reviewed the Espresso Coffee Kit Kat awhile back and I wish I could still find some in the stores because I would love to eat the Espresso Coffee and the Tiramisu Kit Kat one right after another just to see if there really is any difference. Having eaten them a month or so apart my guess right now is no and they just changed the packaging.
The Tiramisu Kit Kat is white chocolate with the coffee flavor concentrated in the wafers. It smells like tiramisu and it tastes very close to it. Where the Espresso Coffee Kit Kat fell short with the choice of white chocolate, this time the white chocolate enhanced the flavor. But in the end it still tasted a lot like the Espresso Coffee Kit Kat. Either one would make a great snack with a cup of coffee, so despite my suspicions I give this one two thumbs up.