I think its not....because you always have to go all in and the calculation starts there.

EV means expected value and it is just a statistical one. At the moment you go all in the odds are calculated.

Now here is an example: both player stacks are 100

PF: Hero bet 100 Villian call 100. If you have odds 80/20 and you win your EV will be adjusted by -20

PF: Hero bet 30 Villian call30

Flop: Hero bet 50 Villian call 50

Turn. Hero go all in with 20 Villian call20.....now if you have in this point odds to win 80/20 we have the same situation.....your EV is adjusted by -20

Because at the and you win or you loose the same amount. You just have to calculate the odds just after both players go all in.

I hope i am not much wrong again

)