If the DC voltage across the cap at all times is below 400VDC, then yes. Otherwise no -- the cap will stress out and turn into a wire or an open in the circuit. And maybe burn and create a mess, ruining everything around it.
Lower voltage caps
Dear All can a cap of 0.33uf 600VDC be replaced with a 0.33uf 400VDC tested at 800VDC