Kelvin was developed from Celsius. The only difference is that 0° is based on absolute 0 (because it's logical and constant) rather than the rough freezing point of water (a vague and inconsistent reference point). Every degree change in one unit is exactly the same change in the other.
That depends how you count “a lot more in common”. The reference points for zero is much closer for C and F. People commonly use in everyday life C and F, but not K. Should I continue?