Yes, PrestaShop Enterprise is still based on the open-source software of PrestaShop. This means that you retain full ownership of your code and data, and that you have access to the source code, thereby allowing you to extensively customize your store, just as with the open-source version.
However, there are some differences in the management of customizations: on Enterprise, it is strongly recommended to install only certified or validated modules to ensure compatibility and security, and checks are in place to limit problematic customizations and maintain the stability and security of the platform.