What is the difference between face moisturizing fluid and face moisturizing cream? 

The texture of the face moisturising fluid is lighter than the texture of the face moisturising cream, which is richer in nourishing and protective active ingredients.

The face moisturising cream contains, for example, shea butter, squalane and essential fatty acids that will better protect the skin in case of stress due to cold or dry weather.
The face moisturising  fluid contains, among other things, an active ingredient that, on the contrary, will absorb excess sebum that may be the result of hot or humid weather.