UVW on the yellow sticker is the total weight measured on the scale, not just axle weight. That is a DOT requirement, as is the GVWR on that same sticker.
The yellow sticker does not usually tell you how that weight is distributed, axles vs tongue. Some manufacturers might measure the tongue weight, but that is not a DOT requirement.
The white sticker will tell you axle, tire and gross vehicle weight RATINGS, not weights. That is also a DOT requirement.
White sticker is thus engineering information, yellow sticker is measurements.