Hello,
No. Both are different. As the major version change is there, there are lot of changes.
Please refer "http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/release-notes/as-x86/" for more details regarding the things introduced in RHEL 4 than RHEL 3.
Thank you.
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With Best Regards,
Abhilash V.Nair
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