Concealment offers physical protection. Concealing something or someone means to hide it completely. It is not in plain sight and it could be easily overlooked here. Camouflage, however, is meant to allow something to hide in plain sight. You’re supposed to be able to stand in camouflage and be seen as part of the local environment, not as yourself.
This can be a challenge if you’re not good at camouflaging yourself. However, concealing yourself will offer the better protection. This is why military snipers often use camouflage as part of their concealment. It makes them look like they belong, and it keeps them and their gun hidden. It’s also a useful distinction to make for fiction writers.