Hi Jus,
I think glargine is the generic label for Lantus, which is the only such insulin currently available, made by Aventis. Novo Nordisk make an alternative, called Levemir, the generic name for which is Lispro.
I was diagnosed back in the 80's, when only animal derived insulins were available. I had issues at the time because I was a committed vegetarian!The porcine insulin I used then is very similar to human, with only one difference in its molecular chain. It is being phased out of production, slowly, but is still available through the NHS on request. It's only available in vials, with disposable syringes, so doesn't have the convenience of the pen devices used these days.
The UK Cochrane Collaboration in 2002 couldn't establish any superiority of analogue human insulin over animal derived insulins, so the jury's still out in some ways.
All the best,
fergus