How to reveal 3 masks with Stroke in After Effects
If I understand this correctly, your goal is to be able to adjust the stroke effect in one shape and have it applied to every other shape, right?
If so, here's how I'd approach this:

create your shape layer and add the stroke effect to reveal the image
Pre-compose the shape layer
Duplicate the precomp three two times and scale them, so you have three different sizes
To remain the same thickness of your shapes, you could apply the &quot;min-max&quot; effect and widen the alpha- and colorchannels to make the shape appear thicker.

If you now adjust the stroke-effect of the shape in any of your three precomps, it is applied to every precomp, effectively changing the animation for all the three shapes.