Here are the Gross Domestic Product (GDP) figures for these two countries:

Sweden: https://tradingeconomics.com/sweden/gdp-growth-annual

Finland: https://tradingeconomics.com/finland/gdp-growth-annual

Looking at those charts they show very similar economic outcomes for the two countries.

Of the last 4 COVID effected quarters Finland won two and Sweden won two.

And Sweden actually felt the highest quarterly contraction at -7.7% compare to the -6.1% for Finland.

That 0.4% difference in death rate is measuring survivability as it records the chance of dying from the virus.

That 0.4% difference suggests Finland's health system was better than Sweden's at handling the virus, as your chances of dying were much less.

When it comes to actual deaths Finland was doing over 830% better (i.e. 168 per million compared to 1406 per million) than Sweden.

Edit: Fixed my bad math. My 90% better figure was out by a factor close to 100.

The more cases you have, the more overwhelm your testing system is. The difference in death rate is most probably due to the fact that Finland was testing more positive cases (relatively) to Sweden.

Note it death rate of infected, if you have less infected the death rate should be unaffected as long as you have enough resources to treat everyone equally well.