On the same 65 000 € gross, a worker takes home roughly 4 381 kr more per year in Sweden than in Finland. That gap reflects the tax structure alone — before rent, healthcare, or savings behaviour come into play.
Housing is the first multiplier. Finland has moderate rent pressure, while Sweden has high rent pressure. That keeps Sweden's nominal advantage closer to a real-world advantage.
Healthcare and pensions go in the opposite direction. Finland runs a universal healthcare model — Public healthcare via wellbeing services counties; private add-ons exist. Sweden uses a universal model — Universal regional healthcare with capped patient fees. The country with lower take-home often shifts costs that the other country leaves to your private budget.
Net-of-everything, a relocation decision should weigh comprehensive welfare state in Finland against comprehensive welfare state in Sweden, plus differences in pension capture, social safety nets, and city-level cost of living.