You asked:
If you have a number of wine tanks,say in a winery, that have the same variety grape , with the same wine making values,i.e. PH, Acidity,residual sugar, etc. But the taste is slightly different between tanks. Do you have to have different labels for each tank?
Grapes harvested from the same vineyard on the same day, fermented at the same time using the same method, yeast and nutrients, and tucked away for a period of time in separate tanks/kegs/barrels/casks made from different materials i.e., oak (american and french) stainless steel, double density food grade plastic, or glass will age differently. each container will impart different (or no) flavors. The capacity of the container will effect the aging and maturation of the wine within.
For example, one ton of cabernet grapes fermented and then racked into two side-by-side French oak (59 gallon) barrels and aged for the same duration using the same topping wine and the same racking procedures, and the same fining materials will taste different from each other.
The short answer is no, but.
Now for the questions for the long answer:
Are the wines in the "tanks" from different vineyards or AVAs?
Are the grapes from a different harvest?
Do you intend to bottle as the "same variety grape" or will some of it be blended with other(s)?
If any of the answers to the above questions are yes, you may need new labels for each.
ted