Even with reliable figures, you definitely cannot just "do the math yourself pretty fast". You are ignoring a whole bunch of things like cost of living differences, working hours, working environment, anything that comes on top of the "gross" like employer pension and insurance (not just health) contributions. For example, the average working hours in developed Europe is 10-20% lower than in the US[1].
Also, as others have mentioned, you can't really take one specific profession and extrapolate. The European labor market is definitely less free-market and by design slower to adapt to shifts. There is a cultural preference for more equitable pay even at the expense of the so-called meritocracy. Software developer salaries in the US have perhaps increased faster than other professions, and less so in Europe. Maybe that's unfair, but the inequality that results from allowing labor markets to move at market-speed causes its own problems.
[1] https://en.wikipedia.org/wiki/List_of_countries_by_average_a...