Refer to the figure.
All aircraft for a given configuration of flaps/slats; no matter the weight, air density, or bank angle; will have a fixed stalling angle of attack. This is known as the critical angle of attack and it is a fixed value per configuration.

The speed at which the aircraft will be flying at the critical angle will change with weight, air density, and bank angle, but the angle of attack will not!

Fun fact: In case of an unreliable airspeed indication, modern aircraft like the 787 can generate an airspeed based the angle of attack sensor. The system will use information from the actual weather conditions, weight set in the FMS and other factors to generate an airspeed value from the AoA.