The biggest notable difference is that Greek Baklava uses walnuts, spices, and a honey based syrup (like what this recipe uses). Turkish Baklava uses pistachios instead and omits the spices but sometimes includes citrus in the syrup. There’s also Lebanese Baklava which uses a simple syrup flavored with with rose or orange water. Really though, there are so many ways to make this delightful dish and just because a certain way might be more common in a region does not mean that’s the only way it’s made there.