can anyone bring out the difference between what is expected from a Data Center Manager and a Data Center Administrator?
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Titles vary by every place you might work...
Regardless, the DC Manager is probably responsible for the entire data center, has multiple supervisors and others below them. May only be responsible for certain aspects of the DC such as only cabinets and servers, or could actually be responsible for the entire facility, much like a General Manager type of position. Again this all varies.
The DC administrator is someone who would report to one of the aforementioned supervisors or managers. This person is often responsible for actually making changes to things, monitoring devices and deploying new stuff.
Again, this all varies across the board but should give you a good separation of responsibilities from a general view point.