IronWolf
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Again, those are SOFT, suggestion tables for DC. They are in no way HARD DC numbers as the ones in 1E.
Please read the skill descriptions and apply the verbatimness you do to the 1st edition rule books:
Check: The DC for opening a lock varies from 20 to 40, depending on the quality of the lock, as given on the table below.
Then the table below:
DC20 Very Simple Lock
DC25 Average Lock
DC30 Good Lock
DC40 Amazing Lock
It seems you read the 1st edition rules with one filter and then apply a different one when reading the 3rd edition rules.