Porous concrete exterior wall 15 cm instead of 17 cm? Experiences/tips?

Hi, does anyone have experience with a 15 cm exterior wall of aerated concrete instead of 17 cm?

There is apparently an extra insulation in connection with the 15 cm stone which is also significantly more expensive. The insulation value is supposed to be identical.

It is done when more q2 is to be achieved but the house must not be enlarged.

Thanks for the experience values

P.s. please only respond if you have experience with it or real information.

are you sure that these are aerated concrete blocks. As far as I know, there is no 15 cm aerated concrete block with the compressive strength to function as a load-bearing exterior wall. Please write the exact type of block here.