Differences between ばよかった in N4 and N3

There are two ばよかった lessons in BunPro. The first is here and second is here. I do not see how they are different.

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Ah I thought something was up with that. The N3 one seems off as it has no write up.

たぶん、かれたちは作らなければよかった。

Maybe they shouldn’t have made it … boom boom