Concrete is a composite material so all products will slightly differ. We use different mixes for our various products so they will not all be 100% similar in terms of color and texture. Small air bubble voids is a natural occurrence in concrete casting.
Wipe with a fiber cloth or wash with soapy water gently if necessary. Due to the nature of the material, concrete might chip against certain surfaces. Avoid knocking against hard surfaces and try not to drop it from a great height.