The systems are different, but saying they are completely different is really a stretch. There's a GST that the US doesn't have, which is, ironically, a regressive tax. If you ranked the tax code of countries by similarity to the US tax code, I'm not sure Canada would be at the top of the list, but it wouldn't be that far down.
Further, it's incredibly difficult to quantify countries on this purported socialism scale. Sure, Canada has universal healthcare like every single developed country but the US, but otherwise it's much more of a mixed bag. The US has always been vastly more "socialist" than its advocates think -- the military is a colossal make work project and is straight out of Soviet doctrine for central planning -- and of course the entire agricultural industry exists under a massive subsidization regime, but under the current administration....whoa.... There is no Western country that has a central planned economy, with a president that is taking direct control of corporations (US Steel) and demanding ownership of corporations (TikTok), while enlisting private executives as members of the military exactly like China (https://www.theguardian.com/technology/2025/jun/25/meta-exec...). Absolutely no one in the US, looking very Stalinesque ala the late 1930s, should be throwing stones about socialism.