Does Sour cream, light density change after the container has been opened for several days?

Marginally. Butterfat can separate or bloom, but measured weight per cup/mL stays within 1 % as long as the product is within its use-by date.

Can I swap whole Sour cream, light for skim at the same gram weight?

For mass yes, but fat content changes flavor, browning and texture. In baking, match the variant the recipe expects rather than the raw gram count.

By Fidamen-Chefsolver Team | Reviewed by Ugo Candido

Light sour cream is tangy and creamy with reduced fat for topping and mixing.

Ingredient

Use on tacos, baked potatoes, dips, dressings, and quick sauces.

Does Sour cream, light density change after the container has been opened for several days?: Marginally. Butterfat can separate or bloom, but measured weight per cup/mL stays within 1 % as long as the product is within its use-by date.
Can I swap whole Sour cream, light for skim at the same gram weight?: For mass yes, but fat content changes flavor, browning and texture. In baking, match the variant the recipe expects rather than the raw gram count.