A seal is supposed to be difficult to counterfeit:

https://www.reddit.com/r/AskHistorians/comments/4xqfs0/how_w...

As such, there is an argument that a seal refers to a physical object with physical imperfections, which are hard to reproduce. Note that the article is about the "design" for the seal, as distinct from the seal itself. Maybe the plan is to manufacture a physical seal off the design (complete with manufacturing imperfections) then use that to make impressions?

Logo has to work in many more contexts. You probably aren't going to be embroidering a seal on a polo shirt, for example. A seal will go on your website and marketing pamphlets, but that's about it.

My next question would be is there an economic value of a seal? I would think slapping a logo on everything works all the same. Or am I wrong to think most (everyone except the creator?) people would not know or care about seeing a seal vs a logo.

A seal conveys a specific certification/endorsement while a logo is identifying a company/product/service/etc. For example, if you're a Microsoft Certified Solutions Engineer, slapping a Microsoft logo on your website doesn't convey that (and surely won't be appreciated by Microsoft).