Is it already protected from pregnancy if i change the brand of pill that im using (after 7 days break on pill) but they both contain the same ingredients and dosage?

You continue to be protected if you change pill brands, even if you changed ingredients and dosages somewhat. Occasionally the change will trigger breakthrough bleeding for a cycle or two, even when they are supposedly exactly the same.

If the first pill worked, than the second pill with the same contents should also work. Always be careful and practice safe sex.