Can my toddler hold 2 different kind of infant milk?

my baby is 6 and half months old and is on cow and take stage 2 milk, can i still give him that milk threw the day but change is end feed to cow and gate night time tot milk?
I am giving my 11 month ripened cow's milk and formula to get him adjusted to milk before we stop formula. He is fine.
just a question..whats the night time newborn milk..why is it different?

to the person above and below me, im prety sure cow and gate stage 2 and nighttime baby are formula not cows milk.
Answers:    thats totally fine im doing the same to my 7 month old with exatly matching milk as u, i asked doc and he said thats ok to do
Your not suppose to confer babies under 1 1/2 cow milk, its hard on their digestion.

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