They are made by Sealy; so yes. If you are looking for specifics look here: https://www.reddit.com/r/Mattress/comments/7o6vyd/trying_to_find_more_details_on_a_costco_mattress/. To summarize the Sealy matress made for Costco is missing 2 inches of Sealy support material compared to it's equivalent retail version.
Most tend to be Sealy so in that regard , yes. However mattresses are like shoes they depend on how they fit the individual.
Yes
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