Make aquafabe from scratch - can the soaking water be used for cooking
If I understand correctly when you talk about changing liquid, you mean boiling the beans in a water different from the one in which you soaked them? In that case yes, generally speaking it is recommended to boil all your legumes in a different water, because cooking them in the soaking water will make them less digestible, but it shouldn't have any influence on the composition/consistency of your aquafaba.
The most important is the cooking water, because it is during this process that the carbohydrates and proteins of the legume will transfer to the water and make your aquafaba.