For Cyber Shadow, we use Chowdren on all platforms, so the Steam version is also using Chowdren.
We actually do this for practically all games that ship with Chowdren!
The C2/C3 runtimes are great, but in our case, it makes sense to use Chowdren for everything.
This is primarily to simplify QA (a single version on all platforms), but it also allows us to tailor each version for each platform.
For example, debuggging and fixing low-level issues (e.g. "why is this controller not working?") becomes a bit easier when you control the engine.