1. My father didn't earn much money, so life wasn't easy for us.
2. If my father had earned much money, life would have been easy for us.
Does the sentences have the same meaning?
We don't often use "much" in the positive sense of (2). It would be more natural to say "a lot of money" (or "more money"). "much" is fine in (1).
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We don't often use "much" in the positive sense of (2). It would be more natural to say "a lot of money" (or "more money"). "much" is fine in (1).
Apart from that, the sentences are OK and have compatible meanings. They do not say precisely the same thing, as will be obvious to you.