It really depends on how well you know these persons and the type and cost of said gifts. I think that the cost and level of intimacy of the gift should be commensurate with your familiarity with those who receiving the gifts. If these are friends, then giving gifts would be perfectly natural. If your relationship is a casual one, more on the level of acquaintances, then gifts might be perceived as somewhat awkward, especially extravagant ones. Even so, simple, inexpensive congratulatory gifts might not be amiss.
You have not given much information, but you do hint that they "do not feel the same way." If the relationship is not such that you feel they would consider giving you a gift if the situation were reversed, then it may not be a good idea to give them anything. What is your motivation for giving the gifts?