I'd say with high certainty that yes, V4.2 **will **take Morphs, Textures, Clothing, and Hair that fit V4.0 and V4.1.

Just like the V3SAE update didn't change the mesh, joint parameters, or UV mapping from the earlier V3 versions.

IF V4.2 isn't compatible with any of the earlier V4 content, then DAZ is only shooting their own leg off, because invalidating an entire year's worth of content releases just for what should be a relatively minor update is a colossally stupid blunder, IMHO.

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If you're joking that's just cruel, but if you're being sarcastic, that's even worse.