No it's the same thing. THEY WILL BE USED TO THAT. Tell them what it is for. Just that you're not. ASK (email) if they will be a ref, they will reply (email) to agree, and you won't need to worry from then on wth anything except actually getting to the stage of needing the reference... i.e., getting accepted somewhere! Good luck. This will not guarantee the award, but it will guarantee you 'worry' about the right things!!!