Does a process with CAP_SETUID and CAP_SETGID can always gain full root privileges?

Question

If I have an executable file with CAP_SETUID and CAP_SETGID set inside xattrs file’s attributes.
Will I get full root privileges if such executable call setuid();setreuid();setresuid();setfsuid() with the value 0 ? Or will I only be identified as the root user without having the ability to do things like opening privileged ports ?

Of course, the executable is initially launched from the guest account with uid and gid set to 1002.