Are they the same? Not really.
Online marketing focuses mostly on tactics. It’s a mix of direct marketing techniques e.g. SEO, SEM, social media advertising, etc. It’s easy to do and it’s easy to measure results. A lot of marketers do it (myself included) to drive short-term performances.
Marketing online, on the other hand, is an act of doing marketing – providing solutions to customers – in an electronic form. It starts with a good strategy – understanding the audience you serve and offering solutions to them. It’s harder. It’s time-consuming.
I get stuck in the ‘online marketing’ world now. It’s very hard to get out.