How Figma handle multiple fills?

When Figma has multiple fills with different opacities, the resulting color has different shades depending on the percentage of opacity?

The upper square has the Figma color blend, & the bottom square has a blend that I made trying to replicate Figma’s blend, but as you can tell is not quite the same shade.

Is there a direct formula that I could use to get it right?
I have difficulties figuring out the opacity.

Thank you in advance!

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