Hope you are having good day.
Let me answer your questions here.
1) Can one single UPC be used on the product with similar dimensions but different Colors?
>>>You are right. You require one UPC for one product listing whatever is product size and color.
2)Can one single UPC be used on the product with different dimensions and different Colors?
>>>I guess this question is similar to previous. You need one UPC for one product and it really doesn’t matter how many products you are selling it.
If you run into any other issues at all, feel free to reach out to me, I’d be more than happy to help!
Number: + 91 8447649836, 01905 235864
Have a great day, in the meantime! ?