There is a difference. You are lumping many aspects of starting a business into the marketing category. Identifying a market? That's one of the first things you do when you start a company. It's finding a group of people to market a product to. If that's marketing, then almost all aspects of a business are marketing.
Perhaps you're too young to remember but there was a time when businesses didn't do things like identify a market. They started with a product and focused primarily on how to manufacture and distribute it for the least amount of money. I.e. their attention was directed inwardly and the focus was primarily about economics.
Those dimensions of starting a business that we now take for granted - from identifying a market to branding and visual design of the packaging and other consumer-facing materials - come to us by way of the discipline of marketing management.
