It may be off the beaten path (so i can understand if you just rather skip it), but -- if you relaunch Finder -- does it still disagree with du by as much as 4 gigs? I get the same thing if I relaunch Finder. Dk's theory about the differences in calculation methods is probably correct.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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