Hoffmannseggi are one of the largest terrestrial isopods available in the hobby, so this is very much on the upper-end of the spectrum. Generally speaking most common garden-type species will average somewhere about 1.5cm long, whereas hoffs can hit 4cm! There are other larger species such as some in the Tylos genus, but they're not something than can be captive bred - much like the deep see king of isopods, Bathynomus.
When people ask what I like I still open with: "it might sound odd, but it's [woodlice]."
These are Oniscus asellus absolutely, but your first picture definitely appears to be scaber - you can see their granulation, which Oniscus doesn't have.