What is the difference between a UBC/IBC and Telcordia Zone 4 Spec? (poll 7594110)

What is the difference between a UBC/IBC and Telcordia Zone 4 Spec?

The difference is like night and day!

There is a mild difference, but it doesn't really matter to me.

There is no difference, they are the same.

I have no clue!

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