What is the difference between a breakpoint and a line breakpoint?

They are practically the same thing. Eclipse introduced Method Breakpoints which we don't have in the classic CodeWarrior tools, hence the need for a distinction. The online documentation states that regular breakpoints suspend the execution of a thread before a line of code or method is executed. Regular breakpoints include:

• Line Breakpoint; that suspends thread execution when the line of code it is applied to is executed.
• Method Breakpoint; that suspends thread execution when the method that it was applied to is entered or exited (or both).
• Address Breakpoint; that breaks when the core executes code at the given address.