"What an interesting, and accurate, comparison."
Psalms 49:7, "None of them can by any means redeem his brother, nor give to God a ransom for him: (For the redemption of their soul is precious, and it ceaseth for ever:)"
The redemption of souls comes from Christ. Oblations for the dead do not effect ransom; they release from purgatory after the soul has been redeemed.