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You need to do both. From someone in the know:

It's basically two forms, one to your GP and one to NHS digital. If you opted out of care.data when they tried that, you don't need to do the second form (you can check whether you did or not here: https://www.nhs.uk/your-nhs-data-matters/manage-your-choice/) but you might want to opt out for any children you've had since 2014.