The free space is clearly marked as having 16GB of RAM, but I don’t think the Zero GPU space available in Pro has that marked.
I happen to know this because I’ve been trying various things for one reason or another, but it appears from python that the amount of RAM itself, including page files, has not changed between the free space and the Zero GPU space.
However, I am not sure if it is a benefit of having a GPU, or actually slightly more CPU and RAM, or why for sure, but there is a phenomenon where programs unrelated to the GPU do not run in CPU space, but do run in Zero GPU space.
However, as long as it is not explicitly stated, it would be wise to consider it as an “extra”.
Of course, the difference from free space when using GPU and VRAM is obvious: Quota is too tight to use casually, but it is blazing fast during the 30 to 120 seconds when GPU is available.