Paths Short or Long

I am working through a problem with path names. The previous version of a site used short codes for url paths. Coming into this for a new project and the short code based paths, while deterministic, seem user-unfriendly to me.

Example current

as1/u2/m4/s7

Example longer

assume-1/unify-2/mobile-4/sturgeon-7

The words are changed so client info isn’t released. The content is linear and so numbers have meaning in context.

My question is this. Have there been any UX studies done to show whether or not this makes any difference. SEO is no consideration as all this content is behind a paywall and is internally indexed/searchable.