That's why I pinged annalex as my Catholic "censor maximus." :-)
I am no expert on this, but in exhanges between the Orthodox and the Catholics, the Latins assure us that their concepts of good works (through faith) and similar issues are identical.
The Purgatory is a different issue. But even there they assure us that our understanding of their concepts is a matter of differences in languge and concepts and not of faith. That I am not sure of.
There is a subtle difference on substance, I think, regarding the Purgatory, but I cannot quite put my finger on it. I promised Kolokotronis a good discussion on the Catholic theology of merit to see what exactly this thing is. But I also promised him a review of the excellent Cavarnos's book on iconography. One day, we'll get there.