No, there isn't. There's only a 30 difference in Deoxys-Normal def & sp. def, whereas on a Deoxys-A, the 30 is invested into Attack & Sp. Atk
For all it's worth, Deoxys-N will only be able to take a very small increase of damage than Deoxys-A, and it will very likely be KO'd anyway. However, Deoxys-A will have a better chance of taking its opponent out before it takes any damage.