This issue of seeming repetitive is a valid concern. However, with a blog you can never talk about the same topic too often. As long as the blog titles are sufficiently different from one another and the body of the blog has a slightly different educational focus, most people won't notice the similarities. Don't forget that your target audience is trying to educate themselves as much as possible before making a final purchase decision, so they can't get enough information - so long as that information is useful and helpful.
Typically, only RSS followers will see them immediately through their feeds.
The real value of a blog is that the content is 'evergreen'. What that means is that if the blog article is truly informational, new visitors will find it through organic searches and that is where the true value in a blog article exists. It will be a topic that people will continue to search for since new users will always come along that want to look at information about your product or service.
So don’t worry about seeming repetitive. As long as each blog is useful to your audience, they will find them.