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@kkg337
You would usually be taking that white fitting off the ceiling to attach the new fitting (presumably with a metal bracket that the pink fixture screws to)
I would expect the brown to be live and blue to be neutral. It looks like they are connected to the red/black live and neutral behind the white plate but not visible in that picture.
Shouldn't really connect a metal fixture that isn't double insulated without an earth. I can't see one, but is there an earth to the brass connector on the original fitting?