Kitchen oven plug socket advice - stressed!

Hey guys,

Im currently helping my grandmother update her very old kitchen! I'm at a stage where new electrics have been installed however they are white and i would like to put chrome ones on the kitchen worktop wall area for her. i have changed over the normal plug sockets and switches to chrome versions but there is a oven fuse switch, its a switch with a red light that turns on when you flick the switch for the oven - i was wondering if you can switch it over with anyone because the one i have found online says 45amp but i don't know what the amp of the old one is ? can anyone advise ? thanks