Hi,
I think I have answered my own question, but I wanted to double-check with the community first:
Is it safe to delete the DNS zone on Route 53 once Cloudflare is serving all DNS requests? I wasn’t sure if it was replicating from Route53 so wondered If I deleted the zone from Route53 it would delete the Cloudflare records as well!
Merry Christmas!
Cloudflare does not replicate, they only import when you add the domain.
If the DNS service is not tied to anything else on Amazon, then you can safely drop it, assuming the domain is running on Cloudflare.
Merry Christmas
Thank you @sandro much appreciated! 
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