Zenith vs Zenith 2

I just baught a rebuild kit for a zenith carb. I got home and realized that I had a zenith 2 carb. What is the differance, and can I use them on the same model A
 
A Zenith 1 was built by "Zenith" and Zenith 2 was built by "Holley", all the internals were basically the same.
 
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