Only an apparent paradox. See Post 516.
I agree with your post 516. On the question of whether or not there’s a paradox between James 2 and Ephesians 2, though, I hate to say anything that reminds us of Bill Clinton’s bad conduct here, but that just may depend on what definition of “paradox” one uses. I always heard in school that a paradox was something that seemed to be contradictory, but wasn’t, and that was what made it distinct from a contradiction. If there isn’t a word that means that, there should be, because many things can seem to be contradictory, but actually aren’t. I agree that’s the case between James 2 and Ephesians 2. And maybe the apparent contradiction between the two could be called a paradox because a paradox is actually more than one thing, according to Merriam-Webster, and those things aren’t really consistent, which is pretty odd:
Definition of paradox
1: a tenet contrary to received opinion
2a : a statement that is seemingly contradictory or opposed to common sense and yet is perhaps true
b : a self-contradictory statement that at first seems true
c : an argument that apparently derives self-contradictory conclusions by valid deduction from acceptable premises
3: one (such as a person, situation, or action) having seemingly contradictory qualities or phases
It sounds to me like 2a and 3 might describe the situation between Ephesians 2 and James 2.
https://www.merriam-webster.com/dictionary/paradox