I was checking out the pnumbers on the carbs that came on my 70 ta auto challenger and they are supposed to be:

4792 center carb (auto)
4789 front carb
4790 rear carb

But turns out that i have
4792 center carb (auto)
And (2) 4790 carbs.

Are the 4789 and 4790 carbs the same carbs just setup different and thats why they carry a different part number or are they different and not interchangeable?