I suppose you are registered for sinle premises in respect of Service Tax & Excise.Further, you have also registered your Gurgaon office as ISD.
However,since you are registered for ISD at gurgaon office as well, you should also show necessary details of ISD as well viz (i) CENVAT recived for distribution (ii) CENVAT distributed by ISD to units(!!) CENVAT inadmissible (II) CENVAT distributed (II) CENVAT balance pending for distribution. You may also refer to amended (w.e.f.01.04.2012) Rule 7 of CCR for manner in which credit should be distributed by ISD. This is in addition to CENVAT details of corncerned unit.
However, your query is not clear as to whether you are service provider or Manufacturer. If you are only manufacturer and CENVAt credit relates to goods being manufactured by you and you are not utilizing CENVAT credit for payment of service( which you are required to pay in cash e.eg. Reverse charge mechanism) tax, you can show balance in Excise Return & not show same balance in Service Tax return as it creates confusion at the time of scrutiny of service Tax return.Since you are disclosing the CENVAt details in Excise return and CENVAt has nothing to do with Service Tax in as much that you are not availing any CENVAt credit in connection of output service Tax and also you are not utilizing any CEENVAT credit for payment of output service tax. Therefore, the entire CENVAt credit details can be omitted from service Tax return. The dept should not object this as this is reported in excise return.
However, if you are both service provider as well as manufacturer & paying both excise duty as wellas service Tax from CENVAT, you should disclose CENVAT details in both Service Tax as well as Excise return. In that case, Yes, CENVAT balance for corncerned unit in both Excise Return and Service Tax return should be same.