All the sticky colors are not in the ‘stock color’ choices for other objects and text. So if you want to create objects that have matching colors you need to use the eyedropper to match the color.
Sticky colors in stock colors
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In the meantime, here’s hack-of-sorts workaround…
if you want to use an exact sticky color in a text box, shape, or Card without using the eyedropper, you can
From sticky:
To shape: