Invulnerable Rager / Magus damage shield question

[Jeff Clem]

Would the Invulnerable Rager Dr stack with the Magus damage shield arcana ability?

Damage Shield (Su)
Benefit: The magus can spend 1 point from her arcane pool as a immediate action to resist damage from each attack she is subject to in a single round. She reduces all damage dealt to her for each individual attack by her magus class level for 1 full round.

[Nefreet]

Normally DR doesn't stack, but the Magus Arcana doesn't appear to use the term, so I'd imagine they'd work together.