Okay, I'll write a bit more slowly, maybe then you understand the difference:
Saying it slowly will not make you correct, in the same way yelling at someone whose language you don't understand won't make you speak their language.
Hexblade is the name of a build for the Warlock class introduced in Heroes of Shadow.
'Sorcerer King Pact' is another build for the Warlock class introduced in the Dark Sun Campaign Setting.
Wrong, and wrong.
Hexblade is a
class type under the warlock class, with two
builds in the first book, Fey (accurate) and Infernal (hard-hitting)
The Sorcerer-King pact is a
build for the primary warlock class-type (as of yet unnamed)
Both class types have some features and powers that cannot cross-pollenate, and some that do. This doesn't make them incompatible.
I only have the PHB1, not the HotF*** book.
This means, I can use everything from the 'Sorcerer King Pact' build in my game.
I cannot, however, use everything from the Hexblade build in my game.
You can't use anything from the Swordmage, Sorcerer, or Bard in Arcane Power either. It's the exact same problem.
Moreover, you CAN use stuff from the Hexblade class type.
When reading the Hexblade stuff in HoS I kept wondering how it's supposed to work, obviously I'm missing some important information.
You make a +3/1d10 or +2/1d12 one-handed weapon, and you run into people, and you do massive damage with attacks that can benefit from your implement and your weapon feats simultaneously.
What is this if not a compatibility issue?
Because it's a reading comprehension issue. Compatibility issues arise when things cannot work along side each other. A base warlock and a hexblade can be in the same party together, fighting the same monsters. They're going to be as different as a Swordmage and a Sorcerer in playstyle, however.
That's not incompatibility. That's how class types work. They're pretty much new classes, but they can take some powers or feats or options older classes can.
Swordmage is a different class than Warlock, not a different build of the same class.
Hexblade is a different
class type. That's the game term for it. It's a subclass, not a build. It's like the difference between a 2E Fighter and a 2E paladin, which were subclasses of the Warrior class.
I would not expect to be able to make full use of everything from a different class.
Then you're halfway to understanding how class types work in the game.
To use things from a different class usually requires multi-classing or playing a hybrid.
Class types have less barriers between types for the same class, but barriers exist, just as they do for different classes within the same power source. Some things are the same, some things are not.
Neither should be required to use things from a different build of the same class.
And we're not talking about different builds. We are talking about different
class types. The problem is a comprehension issue. You're not using the right terminology, so obviously it's not conceptualizing properly.
Do you understand the difference between a build and a class or should I elaborate? I realize you're new to the game and might have trouble with these terms
Class types. It's a game term. You might not be familiar with it, after all it involves books you might not own. But it's a new concept and one that I think you need to understand to help you get past these issues you have.