The change from 168 to 180 seats will probably just mean that the current aft washrooms will be relocated to the very back of the plane, going hand in hand with a much smaller aft galley which equals to two additional rows. It‘s just the normal A32V configuration vs. the A320.

https://www.aerolopa.com/lh-32v vs. https://www.aerolopa.com/lh-320-1