Think it varies fro airline to airline. If we have an aircraft swop or tech issue where pax have to get off and reboard even the same ac. A new safty demo is made. If we return to stand ofter the demo and pax remain on board then a 'recap pa' is made to remind pax of safety features. Also, all our safty breifings show the use of the life jacket, even MAN-LGW.