Updating Features With Csv Import- Leave Unchanged Features Out Ok?

I have six features and two of them have changed for my entire database, the other four do not need update. Is it possible to update these two features by importing a CSV file which contains only the updated features? For example, example line 1 below has full set of features, example line 2 has only two which need updating.

example Line 1

“Artist: T[in-house]; Brand: T[Byers' Choice, Ltd.]; Medium: T[Mixed media]; Height or Width: O[14]; Edition Type: T[Limited Edition]; Edition Size: T[production year]”

example line 2

“Artist: T[in-house]; Brand: T[Byers' Choice, Ltd.]”