Vinegar is the product of fermentation of sugar to alcohol then alcohol to acetic acid.
To simplify, If we have
A) 100g/l sugar which is fermented to 3g/l alcohol which is fermented to 25g/l acetic a.
B) 150g/l sugar fermented to 3.10g/l alcohol which is fermented to 30g/l acetic ac.
Taking in consideration the slightly different alcohol amount, can we say that sugar in A wasn't fermented as well as in B?