@ankara-- I'm not sure what you mean by different but marketing campaigns do have to fit in with the goals of a company's overall marketing strategy. If it doesn't, the marketing campaign won't serve its purpose which is to get the company closer to its goals. The difference is that a marketing campaign has more specific goals than the marketing strategy.
The main marketing objective for all companies is to increase its sales. But a marketing campaign will concentrate on a specific product and will set specific goals. For example, company A can start a new marketing campaign where the goal is to increase the sales of its chocolates by at least 15% in the next one year. This marketing campaign fits in with the overall marketing strategy but creates more concrete goals to work towards within a specific time frame.
Does this make sense?