Games : Card Rarity Ratios between Expert and Goblins Versus Gnomes Packs

I just asked about the difference in totals of collectible cards between Expert packs and Goblins Versus Gnomes packs: Card Counts for Expert and Goblins Versus Gnomes Packs

So clearly Expert Packs are drawing from a larger pool. But I'd like to ask a couple follow up questions:

1. 
   

   What is the ratio of legendary/epic/rare/common of the collectible Expert set compared to the collectible Goblins Versus Gnomes set.

   
   


2. 
   

   When opening a pack are the chances to draw a specific rarity adjusted to accommodate the difference in ratio.

   
   

In other words, do I have a better chance of getting a legendary when opening an Expert pack, a Goblins Versus Gnomes pack, or are my chances the exact same?