The differences between B2B and B2C content marketing comes down to the size of their audience. B2C relies on reaching a lot of people who spend less, whereas B2B reaches less audiences who spend more.
The types of purchases businesses make is different, it is more considered and researched. This means B2B content marketing can be a bit more precise, and go deeper with their content. Wheres B2C has simpler messaging and an easier to understand proposition.
B2B has a longer sales cycle, so content can fit in multiple parts of the purchase journey, to help prospective customers through the journey. In fact good content marketing should accelerate the B2B sales cycle.
Where B2B distributes their content may change too, destinations like LinkedIn & Google may be more appropriate.