It's okay to use 2 different name brand bottles for breastfeeding right?

Should be fine: Once breastfeeding is well established and your baby has regained its birthweight, it is ok to introduce a daily bottle, especially if you need to return to work. It is good to do this between 2-3 weeks of age. If you have a flexible baby, they will adapt to different nipples. If not, you might find that it is best to stay with one kind.