Large differences in transmission power between the AP soft 3.x and 4.x / 6.x

Large differences in transmission power between the AP soft 3.x and 4.x / 6.x
Example: Poland/channel 100
cn410 soft last 3.x 15dbm /2.4 GHz 25dbm / 5GHz,
xv2-2 soft 6.2 15dbm / 2.4GHz, 17dbm / 5GHz,
e505 soft 4.1 device, 16dbm / 20dbm.
Where do such differences come from? All devices have the same power?
Can we make it common to the standards that are in force in the 3.x software for cn410?

Different APs have different antenna gain .
Final AP transmit power = Antenna gain + AP max tx power

I understand, but when setting the country to Germany, I get the xv2-2 split of 20dbm / 2.4 GHz and 24dbm / 5 GHz?
In my opinion, the table with acceptable norms for regions is wrong.
Can you start using the same table on all devices? Currently, I have the impression that every version of the software has different settings. At the moment I wanted to replace the e410 devices with the xv2-2 and there is no chance because their range on the settings of my country is lower by over 30% :(!?!