Sterile lab needles vs medical grade needles?

So in the state I recently moved to, apparently amazon will not ship any kind of actual medical grade needles on the site due to some legal nonsense.

Many of you who have bought needles off of amazon are probably familiar with the large amount of sterile "lab grade" or "vet grade" needles on the website (some of you are probably already using them). My question is, as long as its sterile, does it actually matter?

I assume that the difference is just a certification? If not it's very concerning reading the comments on amazon of so many people using them for testosterone.