Hi, Lee here, I created BOTH of email templates you're referring to. In fact you can use my Grunt workflow to create more https://github.com/leemunroe/grunt-email-workflow/

There are several differences with the templates for sale on HTMLemail.io: More layouts, a 6 column grid, better responsive support for mobile (including Gmail apps), includes high resolution image assets for social media and app store buttons, better support across all clients including Gmail and Outlook.