Different cubic-bezier() presets in Chrome DevTools

This is more curiosity than anything. I noticed that the `cubic-bezier()` presets in Chrome DevTools are different from the values here.

For example, this is what Chrome DevTools suggests for `Out - Cubic`:


And this is what Easings.net's `easeOutCubic` looks like:


Although the values look quite different, I compared them in DevTools, and the resulting curves are very similar. But, not exactly the same.

I find this rather strange since Google themselves reference and recommend Easings.net here:
https://developers.google.com/web/fundamentals/design-and-ux/animations/choosing-the-right-easing

My understanding was that easing functions were predefined mathematical equations, not open to interpretation. So how is it that these can differ?