Being pedantic - do you mean "00" pasta flour or "00" pizza flour?
The "00" rating is on the coarseness of the milling, different wheat varieties are blended for different purposes.
Supermarket "00" is a generic size grading.
Being super fussy "00" flour would be used for Pasta and "0" for bread and pizza
Italian Flour
In Italy, flour is categorized according to how finely milled it is. The numbers are obtained by measuring the quantity of flour in kilograms after milling 100 kg of wheat. The higher the number, the coarser it is. ’00’ flour seems to be the most difficult one to replace: it almost feels like baby powder, and it is so fine that the best quality in Italy is called ‘Fior di Farina’ (lit. ‘Flower of Flour’, meaning that it is the best and finest). It is great for sweets and pasta.
- 00 Flour (ash content ~ 0.55%) is the finest, and obtained by only milling the inner part of the grain, with no bran or residues, so that protein and starch are the only things left. Very poor nutritionally, but very efficient in the kitchen, it is used for fresh pasta and baked sweets;
- 0 Flour (ash content ~ 0.65%) is coarser and tends to be stronger, and is generally best for bread, flatbread and pizza making;
- 1 and 2 Flours (ash content ~ 0.85% / 0.95%)could be considered half whole-wheat, as they contain parts of bran and are richer in protein and starch. Best for pizzas and breads;
- Whole Wheat Flour (Farina Integrale) (ash content ~ 1.70%) contains all of the grain, and in Italy it is usually used together with a finer flour. All the nutrient content is preserved.