E-business is the exchange of documents between computer systems of business partners while e-commerce is the electronic transfer of money from one bank account to another via computer-based systems.

They have the exact same meaning and can be used interchangeably.

There is only one e-commerce model (B2C) but there are two e-business models (B2C) and (C2B).

E-commerce is a subset of e-business that happens if a financial transaction takes place during e-business processes.

In e-business the two sides of exchange are businesses while in e-commerce one side of exchange is businesses and the other side of exchange is consumers.