Solid State Electronics: Depletion vs Space-Charge region, what's the difference?
Each depletion region can be called space-charge region, but not all space-charge regions are formed due to depletion.

Space charge region = there is some surface area or volume where charge integral is not zero. In other words, there is some net charge present in this area or volume. Space charge regions can be formed due to various effects, including depletion effect.

However, in literature on semiconductors physics, space charge region usually refers to depletion region (I can't remember seeing any exceptions).

It is a good question by the way - it shows that you're really trying to understand the physical meaning of these terms.