Because the internal format of a security descriptor can vary, we recommend that applications not modify the SECURITY_DESCRIPTOR structure directly. For creating and manipulating a security descriptor, use the functions listed in See Also.
So, nobody knows unless you 1) reverse-engineer it, or 2) work at Microsoft
Probably you can find some info online about (1) if someone has done it, but why? It won't be portable to different Windows versions.
EDIT: Btw if you want its "size" then I did with MinGW-w64 and it was like this:
SECURITY_DESCRIPTOR_CONTROL seems to be a typedef for WORD, no idea about the others, if you are so inclined to do it, then download MinGW-w64 and look in the header files yourself. (you ask very low-level question so be prepared to do a lot of research, just saying)
All you can know probably is that its size is the same (if you need to allocate it).
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