Yes, absolutely.
Kali is Shiva in his absolute femininity. The projection or the executive power (Shakti) of Shiva depicted in a female form is Kali. And vice versa, the stable base or the consciousness that eternally holds Kali depicted in a male form is Shiva. The relationship of Shiva and Shakti is beyond everything, unlike in humans or animals where there are two different entities or souls that come into a relationship, for example.. A husband and wife, in case of Shiva and Shakti, it's one Supreme Entity that functions in duality.. However, the truth is non-duality.
So definitely, Shakti is not separate from Shiva. The Ultimate Brahman has two aspects– Purush and Prakriti.
One is the static, unmoving, still consciousness and the other is the flowing, active, dynamic energy. The static aspect has the flowing energy to keep it charged and the flowing aspect has the static consciousness to hold it in a right direction.
The union of these two aspects is the one complete reality. It is only for the expansion that the split happens and then creation takes place, from one to two to infinite forms are taken by Parabrahman.
Har Har Mahadev 🙏 Jai Mahakali 🙏