Totally is.
If you google it, you'll find that "normal" silk is made by boiling the grubbies before they get 'emselves out, because when they get out they use a special secretion that basically slits the silk cocoon all the way down, ending up with a whole lot of short threads. If you kill the grubbie before it does that, you end up with one long, single thread, which gives the silk incredible strength and that gorgeous, living (ironically) sheen that it gets.
But tussah/vegan/peace silk uses the short fibres that are harvested after the grubs come out, and thus it has a slightly furrier texture and isn't quite as strong (but still much stronger than cotton, apparently). It's also got a kind of "halo" against the light, because of the many smaller fibres rather than one long one.
\m/ Kat