Thanks IIYAMA, FindRotation3D worked for the getting rotation.
Did not achieve the desired result with a rocket projectile (19) though. Even after rotating it directly at point_B the projectile eventually starts heading out in a different direction, not exactly sure whats up with that. I think an easy way to fix that is using createObject along with moveObject and stuff, but in this case, what should I use to properly send projectiles from point A to point B since createProjectile only has starting position arguments to work with?