It's using the exact same chassis, but as you mentioned this generation is a significant internal improvement - not just dual-channel RAM, but also significantly upgraded TDP (54W vs 22W) with new dual-fan, dual-heat pipe cooling, plus USB-C PD.
The 15" refresh the PF5NU1G was also launched at the same time initially as the Mechrevo Code 01. I've posted earlier in this thread linking to all the details about it for those that are interested, since I have one.
I'd personally also no longer buy a laptop without usb-c-pd.
Sounds like they've addressed those. I hope Walmart picks it up.