Radlib is a term whose meaning depends on the person using it.
To a DSA baby DemSoc, a radlib is someone like Elizabeth Warren, someone that coopts anti-capitalist criticisms into milquetoast, explicitly pro-capitalist reforms.
To various kinds of commie, all forms of capitalist reformism or incrementalism might be criticized as radlib, so e.g. they might criticize Bolivia's MAS as radlib (hopefully quietly and behind closed doors).
I think we don't know much about CK. It's at least a good thing for "black liberation is incompatible with capitalism" to be a more popular sentiment.
SWCC is more about the direction China took under Deng, which can be anything from praise to neutral to derisive depending on what someone thinks of Deng and that direction (I think it's worked out reasonably well, personally). It is heavily drawn from the direction under Mao, and by necessity cites Mao, so they aren't purely distinct but I would say that means learning about SWCC should involve reading Mao but you can read Mao without SWCC. e.g., the Black Panthers were inspired by Mao's writings and built on them, but did not build on Deng / SWCC.