On the same 65 000 € gross, a worker takes home roughly 16 905 kr more per year in Norway 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 Norway has high rent pressure. That keeps Norway'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. Norway uses a universal model — Universal public healthcare with small patient co-pays. 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 Norway, plus differences in pension capture, social safety nets, and city-level cost of living.