There are a lot of breathing methods out there, like this, and Wim Hof. Is there any side by side comparisons. Side by Side Down to exact method. So many brea

There are a lot of breathing methods out there, like this, and Wim Hof. Is there any side by side comparisons. Side by Side Down to exact method. So many breaths, long, short, lengths, times. I'd really like to know if it all boils down to just O2/CO2 balance, and each method just ends up with a different ratio.