Switching bottle brands

LO is currently 9 weeks old and we’ve been using evenflo wide neck since he was about 2/3 weeks old to help with latching and it was such a huge help ! I now have two packs of gifted Phillips natural bottles in my closet that are going unused because I’m not sure if I can switch between brands of if it would be too much of a difference? I also have size 2 and 3 of the naturals and im not sure which would be similar to the slow flow evenflo wide neck ?