The 5.2 i386 source RPM doesn't contain the 2.0.36 kernel source, but rather a 2.0.35 tarball, plus 2.0.36pre-patch-14 which definitely doesn't match it.
The starting point in the i386 kernel rpm is 2.0.35. There are patches that bring that tarball to 2.0.36 and beyond. The Red Hat kernel is seldom in sync with the "official" ftp.kernel.org version because of security patches and features that are not supported in the "official" version of the kernel.
That kernel reports its version as 2.0.36, hence the RPM version.