Cats love to eat a variety of foods from protein to carbohydrates. The best and healthiest dry cat food should contain high-quality protein and fewer carbohydrates. Many cat owners feed only dry foods to their cats as they contain more protein and do not affect teeth much on chewing dry food.
Dry food is fine as long as it is complete and balanced, cat that eats only dry food needs to be provided with lots of freshwaters, especially if they are prone to developing urinary tract blockages.
Yes, it's possible to mix the dry cat food mackerel with tuna as it adds amazing flavor to their food. The cats often get bored with the same kind of flavor, so adding or mixing the flavors gives change to their food and taste, making it more tasty and healthy.
Therefore definitely you can add mackerel dry cat food with tuna.
Different brands and flavours of mackerel dry cat food and tuna available in the market:
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Like Whiskas mackerel is a nourishing diet, contains real mackerel and poultry ingredients which provide high-quality protein, likewise, the pack of Whiskas that has the flavor of extracts of tuna fish contains protein, fiber, fat, and moisture that provides the required nutrients to adult cat, if both the flavors added to the cat food, gives a different taste and make it more healthy.