World Scale 3D in BP vs Scale in Viewport

Development Programming & Scripting Blueprint
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Hi,

I have set the relative scale of a skeleton mesh (bird) in its BP Viewport to reduce its size and match the aprox real word size of that bird.

But in my BP, I spawn birds with some small scale variation to simulate age.

Now I am confused as for Set World Scale 3D in my BP to simulate the variation in size, is it based on the original 1.0 scale of the skeleton mesh of that bird character or is it rather based on the BP Viewport Scale.

All in all, I am aiming to have a variation in size that has a max scale equivalent to the one I set in the BP viewport and not the original 1.0.

Do I need to use World in the Viewport Scale settings to make the BP Scale 3D based the max on it?

Thanks

Bird BP Viewport Scale adjusted from original to make it closer to real life size:
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In the same BP of the bird, I create a small variation of the size
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