Well, it really makes sense for these every specifically tuned biological machines to all function more or less the same way.

Everything we can glean from neurology pretty much says our perceptions are similar, we just process them differently.

Red is a shorter wavelength than blue. It would make no sense for the brain to interpret long wavelengths as short or short as long, which is probably why our colour perceptions are more or less the same.

Language affects our perception more than the biological hardware we have. The physical sensations are similar to everyone, but processing them is different. Which is why it could still be that your red isn't my red. But my point is I don't think it'd ever be blue or green in any context. It'd je different, perhaps, but not fundamentally so.

The ancient Greeks used to call the sky bronze. Related, there was this cool short the other day. Talked about how someone raised their kid normally other than carefully making sure never to say what colour the sky is, and then later inquiring about it. The girl had trouble at first, but calling it some mix of white and blue. The point in that was that kids learn colours somehow related to other objects. And the sky, as "an object", is a very different category and was thus weird for her to assign a colour to.

Unrelated rant over

I've had this thought many times, glad I'm not alone. Also makes you wonder if possibly everyone's "favorite" color is the same color, we just all call it different things because of how we individually perceive it.

This is a fun thought, but I can disprove this myself easily enough due to having had my favorite color change multiple times in my lifetime. Currently enjoying green.

Apart from the philosophical aspect which is unanswerable, I feel certain we see equivalent colors. This is an interesting article about it. https://en.wikipedia.org/wiki/CIE_1931_color_space Scientists found what the three primary colors our eyes see are. Because of the overlap in cone activation they're actually imaginary colors that don't exist.

Maybe what I see as red is actually what I see as blue to someone else.

This is a very common interesting thought, but what I've started thinking is even more interesting is this related thought:

Why does red look like it does, to you? I'm not concerned with how other people see red here, I'm just thinking about a single person (me or yourself, for instance). Why does red look like that? Why not differently? Something inside your eyes or your brain must be deciding that.

You could say "oh it's because red is this and that wavelength" but what decides that exactly that wavelength looks like that (red)? There must be some physical process that at some point makes the qualia that is red - but how does it do that? The qualia that is red seems to be entirely arbitrary and decidedly not a physical thing. It is just a sensation, an experience, a qualia. But your eyes/brain somehow decides that ~650 nm wavelength translates to exactly that qualia. What decides that and how?

I can't describe the difference of red vs blue and I've never met anyone else who could either.

In the Mask movie there is a great scene where he demonstrates colors to his blind girlfriend. They did a really great job with it.

I'm red-green colourblind(Deuteranopia) and often think this exact thing, how the reality I perceive is different from others purely due to this.

I, too, think about this all the time.