There is a fairly large difference between what your skin is exposed to during the day versus at night. Therefore, as a rule, there will always be a big difference. The same applies to our day and night cream. The day cream is formulated to protect your skin from drying out and act as a protective against the particles you encounter throughout the day. The night cream has been developed to give you all the nourishment needed to rebuild the skin.
The night cream is a much fatter and even richer emulsion. This is because when we sleep, our stress hormone is reduced, which gives better opportunities to absorb richer nutrition. Therefore, our night cream is made to rebuild from the day's damage.