Are they even comparable? Or are their magecraft just different?

I feel like power levels in fate mostly depend on conceptual advantages rather than power.

In my opinion, yep, it's mostly about concept. That's how they defeated God Arjuna, that's also how they defeated Greek Gods in LB 5.

Yeah, one of the coolest things is seeing two figures from different stories fighting. But the Fate power system rarely really allows simple direct “vs” fights. What I mean is usually there are outside factors. Like how capable a master is, or how much magical energy is available. Or conceptual advantages or disadvantages.

Im not really complaining. Conceptual advantages allows generally weaker people to do pretty awesome things. We get things like Napoleon shooting ***** with a giant cannon, or Drake fighting ******** and stealing their *****. Which is such a cool feat.