The graying-out is normal when one mod overwrites part of another, even if it's just one file. It doesn't necessarily mean they aren't compatible. For example, when I apply the OLC MkIId update it grays out OLC MkIIc, even though it's essentially just a patch for the mod.
It does mean that there's a potential conflict, though. Not having used the mods you are, IDK whether or not there is one in your case. But I'm just a newbie. Maybe if you post which files conflict, the veterans can let you know.
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