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Netakure
It's risky using the rear hole as a guide for drilling the front, unless you're using a drill press and a fixture to hold the fork in place, as it's very hard to keep the drill bit flat and level. The Paterek framebuilding manual specifically advises against drilling fork crowns that way. If it was me I'd work out where I wanted the centre of the new hole to be, use a centre-punch to make a punch point at the centre, drill the hole with a pilot drill and then move up to 6mm in two stages using successively larger drill bits.