By the very nature of a comparison table it's going to follow a similar format to your competitors; it's a table that compares items with each other and you're limited with just how else you can do that. They are familiar concepts to web users and are pretty ubiquitous, there's no need to re-invent the wheel. I'm sure your competitor also has primary navigation options, a logo, some tabs, a footer... you're not ripping them off by including these either.
You can still use the same concept of a comparison table, but display it in a different style to your competitor. That's what your branding and visual-design is for - to make the core functionality and concepts stand out and differentiate your site from others.
Here are just a couple of examples showing the same type of concept but displayed dramatically different enough so that they're not confused with eachother: