The first is flat red on pure black. Soft edged forms drift and swell around a bold white FLUID set dead centre, each shape a single saturated tone with the falloff doing all the shading. Nothing in between, just colour and dark.
The second is the same motion in violet and magenta. The shapes carry a gradient within them, cooler at the edges and hotter where they catch light, and the black lifts into deep plum. The contrast drops and the whole frame reads softer.
One hits like a poster. The other moves like light.
The first runs cold. Violet rim light on the planet and the moons, blacks pushed toward indigo, a cyan core that blooms outward as the camera pushes in. Everything outside the centre falls away into shadow.
The second is the same shot regraded warm and dirty. Olive and grey across the rock, pale crescents on the moons, the core burning red with a green haze drifting over its surface. The highlights sit softer and the texture reads harder.
One grade makes it feel distant. The other makes it feel close enough to burn.