Pretty much.

CGTN tweets are tagged with "China state-affiliated media" ( https://twitter.com/cgtnofficial ). RT (which Twitter seems to remove from search results) tweets are tagged with "Russia state-affiliated media" (https://twitter.com/rt_com ). Voice of America has no such tags ( https://twitter.com/VOANews).

Voice of America is part of the US government's executive branch, and was created and is funded by Congress, which comes from the State Department budget. It had some aspects of independence from executive control, many of which Trump did away with. RT similarly is a creation of the Russian government with similar aspects of independence to VOA. One country gets tagged, one does not.