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According to this Wikipedia article, Sweden, Austria, Switzerland, Germany, Denmark, Belgium, and Finland are the top spenders in the R&D sector by PPP per capita.
Does this mean that they pay a higher salary to the PostDoc researchers?
If not, is there any metric to know this?
Postdocs are more or less government employees and so in a lot of EU countries, postdoc salaries are publically available so a little bit of digging will usually tell you the exact salary of any position you see advertised.
However, if you only want a quick rule of thumb to compare different European countries I would go with nominal GDP per capita. Yes, cost of living is higher in the wealthier countries as well, but academic salaries usually overcompensate for this (when comparing countries in Europe). The standard of living a postdoc salary buys you in Switzerland or Norway is much higher than in Greece or Portugal.
If cost of living differs a lot within a country the academic salaries usually do not fully account for these differences so living in an expensive city will make you relatively poorer.
R&D spending does not equate to PostDoc salary. A substantial part of the spending is done by private companies in their own facilities, and private companies typically don't hire PostDocs. Some of the spending goes to stuff (supplies, machinery, laboratories, etc.) rather than people. Salaries in many of these countries are not driven by the available budget. If more money becomes available the universities just hire more PostDocs, rather than pay them better.
If you want to know the salary, you just look at the salary. But do take the cost of living into account. Not at the national level, but at the local level of the university you are interested in.
