replace 700 x 32c with 700 x 28c?

I am considering  replacing my Lugano tyres with Marathon Plus. I'm aware that they are heavier. Are they bulkier because they have an extra layer?  If so, do I size down?  I know people size up on tyres but don't know about down. I'm a bit clueless here. The Luganos are OE on a Cannondale Quick 1 - love the nimble bike but not the punctures!

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