Yes, cure #1 and #2 protect meats against botulism bacteria, along with a few other potentially bad ones. Cure #1 is salt with 6.25% sodium nitrite; NO2. It is used in Bacon (by law) and other cured meats that will be finished processing within 30 days, like sausages, summer sausage, snack sticks, Canadian Bacon, etc...
Cure #2 is for products that will take longer than 30 days to finish processing. The amounts are higher to allow for a longer protection time. Cure #2 is sodium nitrate; NO3. The nitrate NO3 breaks down into nitrite NO2 over time. Products like Salumi, Salami, long aged hams, etc....these use sodium nitrate NO3......