Of course it can but how accurate is your pressure guage? Without knowing exactly how much EAN you have and how much air you are putting in VPlanner (or any blending tool) is only a guess.
If you are out on a boat then stuff the air in and analyse the O2. Way easier and a lot more accurate.
I was presuming that the OP would be analysing the resulting mix anyway! Doesn't everyone check what they've got before they jump in? It's certainly a recommendation from BSAC and PADI, and I imagine, every other agency.
By having one computer on the 32%, the other on 21%, you gain nothing from the extra O2 content of your actual mix and are artificially limiting your depth due to an unrealistic MOD.
Ok you're being conservative but I put in the extra O2 to gain the extra NDL personally. Each to their own.
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