I just came back to post because I wanted to say I also got my info from BossKut forum too.
Yes, you can use the Pazzles housing in the Wishblade such as the embossing, paper piercing tool, etc. It was either Jules or Terri who has a video using the paper piercing tool from the Pazzles to cut out Polymer Clay. I would send you the link but I don't know if your signed up for the forum yet. The only way to access the link is to be signed up so I don't want to disappoint you with a dead link.
Hang on to those housings. Do you have a Cricut? The Pazzles housings are also interchangeable in the Cricut since it was designed by the same team.
Mats you can use Cricut mats and the Pazzles mats with the Gazelle. Some of the ladies use the Pazzles embossing mats with the Gazelle.
Now Melinda over at FunTime Yahoo group said the Cricut deep cut blades are slightly different than the Gazelle blades. It is just slightly. She just posted this a couple of days ago. She even said use them. I know a lot of people are since they are so readily available. and nobody is having any problems.
DH & I held them up under our Ott-Lite and looked at them with a magnifying glass and we didn't see any difference.
You can't use the regular Cricut blades in the Gazelle it MUST be the Deep Cut Blades.
What I learned is that the Gazelle was designed so it could be interchangeable and grow with the die cutting industry.
Any other questions don't be afraid to ask.