See: What's the numbering system for spaghetti and does it matter?What's the numbering system for spaghetti and does it matter?
The number assigned to pastas is particular to individual manufacturers. You would need their data sheet, if they offer one, to know the details based on their product numbers.
On the other hand, many pastas are packaged so that you can see product, and make comparisons. If that is not the case, pasta is not terribly expensive--you could buy a couple of different ones and see which one you like.
