Dark Ages: Mage is very different from Mage: the Ascension.
For one, because it's the Middle Ages, there's no Paradox, because the Age of Reason has yet to happen. That means that all the HAP vs. HOP nonsense is gone.
Magic is a bit more limited, but they created separate Spheres (now called Pillars) for each of the six Fellowships (Traditions). For example, the Old Faith uses the four Pillars of Spring, Summer, Autumn and Winter.
The annoying part is that all the basic stats are in Dark Ages: Vampire, so you need both to be able to play.
I do own the Sorcerer's Crusade book, though.