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The answer for your question is 'no'.
You're never going to reduce power usage substantially by swapping PSUs, because there's just not enough efficiency gains to be had even if a Pico PSU was more efficient which they really aren't.
You say the hardware is 'nothing too different' but you mention ddr4 vs 3, which makes me think the Dell is a generation or few older which could easily impact power draw by 10w.
Particularly in low-load scenarios there can be quite a big difference when it comes to PSU efficiency. While newer ATX PSUs have become better with regards to efficiency at low load, a Pico PSU can still be quite a bit better. Older ATX PSU often don't even reach 60 % efficiency at 5 % load (which would be a typical load for such a system at idle), sometimes considerably less than that. At the same load a Pico PSU can easily be at 85 % efficiency.
Of course, at higher loads the difference is way smaller.
That's fair; I wasn't really considering how poorly performing PSUs were at extremely low loads, despite knowing that they are.
Odd that a random brick would be substantially better than a same-era actual PSU, but I suppose it's hard to say without more specifics.
Switching power supplies ("bricks") are generally more efficient than linear power supplies because they lose less energy as heat. that's were the difference comes from. (Of course they have drawbacks as well, like increased noise)