Hey thanks guys for the information, both have been very useful.
Ive realised that Ive indicated some incorrection information in my initial post by confusing price with index level. Maybe if I explain further it will help you understand the reason of my question.
I work in the back office documenting OTC deals. When we document a deal based on the HSI (for example) we need to specify whether we are refering
to either the Options or Futures contract. In the case of the HSI F&O contracts the final level for these contracts are calculated at the same time using the same method on the expiry date (a system of averaging over the last day). This will thus give a slightly different level to the actual Index which is based on the closing price of each share. Pay out is then always based on the difference between the respective futures or options contract on trade date versus expiry date. Contract size is the same for both. As these are
To me it seems clear that the final level at expiry will be the same irrespective of contract type ; so why is there a need to specify and differentiate? As OTC deals we are only using these contracts as a reference.
The only conclusion that Ive come up with so far is that if a client wishes to unwind or increase a deal during that particular contract month then the trader will base himself on the current level of the respective contract to work out a cost to the client. Hence the need to specify options or futures.
Well hope that was clear.

Cheers