Will concerns the specification of possibilities. In Māturīdī terminology, takwīn is the real divine attribute related to bringing them into existence. Their functions are connected but conceptually different.
Determining a possible thing's time and form is a matter of specification; bringing it into actual existence is considered under takwīn. The known, the possible object of power, the willed and the created are therefore not identical notions.
The created effect begins in time, but its temporal date does not render the eternal divine attributes themselves originated.