The DSi Browser was an updated version of that original DS Browser. Don't know if it was based on the old port, or if it was redone. The DSi was more capable than the original DS, and the browser had to be redone because the old GBA-slot RAM cart was no longer supported. They switched the base to a considerably newer version of Opera. As a major advantage, the browser actually shipped with the DSi, making it much more useful than the two-cartridge getup necessary for the original DS (which, in the end, very few people ended up getting for that system).