There is one thing I always point out when individuals are called out as an exception: genetic mutants whose abilities are ideal for specific tasks exist. Runners who don’t produce lactic acid, swimmers with absurdly long arms, and so forth.

The diagnosis of Marilu Henner’s recall ability as Hyperthymesia (per her Wikipedia article) seems to confirm this is a mutation compared to typical memory formation.

That aside, long term memory is indeed distinct from working memory. Long term memory is formed from your working memory, but the memories are stored separately.