You do have to be sure which of the three ratings (extreme, lower limit, comfort) the manufacturer or retailer is using. It should be clear in the European countries where all three ratings are required, but I've noticed that here in the US, where the EN ratings are strictly voluntary, there is a tendency to use only the "extreme." That's particularly true of cheap bags, which historically have had the most fictitious ratings.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey