It is.
I believe with this one, I've seen all "versions" of Poirot.
I read most of Agatha's books through 70s & 80s. Not sure what is available since probably late 80's.
I watched all of PBS presentation of Poirot... with David Suchet providing what I consider the quintessential Poirot.
Viewing the episodes in that order shows how he grows in the character and how Poirot "softens" as he ages.
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Grown tired of repetitive versions of Orient Express.