With nitrox, as you have the constraint of the ppO2, the maximum depth is reduced. So here, what I would do, is go Air in the first one so you can do a deeper dive, and leave nitrox for the second that allows you to stay longer at a descent depth.
If you want to do the other way around, is doable, but you are not going to be as deep as you can in the first dive, nor have a good depth/time relationship in your second dive.
All operators I did 1 air and 1 EANx with, recommended first Nitrox and second Air. In the profile you are proposing, if you do the math you'll see the difference for yourself!
here's my USD 0.02
Alex
If you want to do the other way around, is doable, but you are not going to be as deep as you can in the first dive, nor have a good depth/time relationship in your second dive.
All operators I did 1 air and 1 EANx with, recommended first Nitrox and second Air. In the profile you are proposing, if you do the math you'll see the difference for yourself!
here's my USD 0.02
Alex