Why diff always exist btw ncdex goldpetal vs goldpetal(New Delhi)?

http://www.mcxindia.com/SitePages/ContractSpecification.aspx?ProductCode=GOLD

View the contract specifications in above link

  • MCX GOLDPETALYYMMM is having its price quote based on Ex-Mumbai

Ex-Mumbai (inclusive of all taxes and levies relating to import duty, 
customs, but excluding Sales Tax / VAT, any other additional tax or 
surcharge on sales tax, local taxes and octroi)

  • MCX ​GOLDPTLDELYYMMM is having its price quote based on Ex-New Delhi

Ex-New Delhi (inclusive of all taxes and levies relating to import duty, 
customs, but excluding Sales Tax / VAT, any other additional tax or 
surcharge on sales tax, local taxes and octroi)

P:S: I am not sure about NCDEX Gold Futures though. 

The value of all products depends on the liquidity.

So, the reason for price diff. between NCDEX and MCX is due to high volatility. 

Above answers Not correct. Delivery unit is same just delivery center shunt make this diff.
Quality also seems same 999.99.
Is there any vat difference for Delhi?
Pls some one who have knowledge pls help,