How purple 200 500 700 define in the color xml of a new Android Project

Question

A new Android project provides a set of purple colors for color primary, etc. I am interested in how the default color code is generated from.

Android default colors.xml

<resources>
    <color name="purple_200">#FFBB86FC</color>
    <color name="purple_500">#FF6200EE</color>
    <color name="purple_700">#FF3700B3</color>
    <color name="teal_200">#FF03DAC5</color>
    <color name="teal_700">#FF018786</color>
    <color name="black">#FF000000</color>
    <color name="white">#FFFFFFFF</color>
</resources>

On the other hand, I found a color tool on material.io that have provided

purple 200 = #ce93d8

purple 500 = #9c27b0

purple 700 = #7b1fa2

which does not match the android default purple color. Is it because it has used a different "purple"? or it changed the opacity?