Android : Android L Preview Factory Image for Nexus 7(razorg) [2013] (Mobile)

I want to update the Factory image of my Nexus 7(razorg) tablet to android L preview.

I am following this link to update.

I cannot find factory image for my model they have given factory image for Nexus 7(razor).

So My question are

1.Shall we use the Nexus 7(razor) factory image to Nexus 7(razorg).

2.If not then how can we get the factory image of Nexuss 7 (razorg)for android L preview.