As the doctor notes, the prescriptions aren't different enough to be concerned since vision tests aren't exact measurements that are necessarily the same each time. The two results fall within the natural variation to be expected. People's vision varies slightly throughout each day, and if their vision is best somewhere in between two test lenses, their vision can change enough to switch which lens is best and lead to a different measurement different times of the same day even by the same doctor. Studies also show a minor variation in results between doctors testing the same patients around the same time, partly since people can have a hard time sometimes with two lenses as to which is better since they may just seem "different" rather than better or worse and so it can depend on the order lenses are tested which result they wind up with.
Your child is farsighted (Sphere) and has astigmatism (Cylinder and Axis). There is no significant difference on the two RXs they are very minor differences. Your child needs these to help the eyes develop properly, prevent amblyopia and squint-strabismus. What is your child's age and what was the vision with the glasses?
JCH MD