When it comes to marketing, anything is possible. Ibuprofen is sold under 4-5 commercial names competing with each other. At the first sight, the Aqua Blocks appear shorter and heavier than the Ear Seals. To be sure, I'd have to take them out of the box. My guess is, these are products with a potential for liability. One is designed to be watertight, to keep ears dry. The other is protection against injury. It is manufactured more carefully, so as to rule out a self inflicted damage when used as directed. It looks to be softer but longer, and a cord is attached for fool-proofing. In the end, if your (or his/her) ear canals are chrome lined, use what you like. In life we improvise all the time, use things off-label and are often proud of being ingenious and resourceful. Personal protection is one place where most people tend to be conservative. This is really a small case in point, not like Kevlar vs homemade bulletproof vest. Good shooting.