These are ALL Asian Lady Beetles (Harmonia axyridis). They come in different colors, different spot arrangements, and sometimes have no spots at all. The females are larger and rounder than the males. The big M pattern on the pronotum is a good indicator, but as you see from these, this is also some variety in this feature, as well.
Backyard and Beyond 
My brother gets thousands of these every winter. When it gets warmer, he’s on constant patrol to destroy the pesky, stinky, furniture-staining, biting pests as they emerge from their hiding places.