Hi Rodolfo , Good Question , Even I wasnt sure about the answer so I have put this question to a good friend who knows about this and the reason as to why some SAM have higher celing and lesser range and some have higher range but lesses ceiling is to quote

“higher altitude ceiling of SAM is limited by diverter fuel energy available (since there is no aerodynamic force available there). So for a fixed divert energy budget the range will progressively increase to maximum ballistic range as the accuracy of ground radar increase to accurately determine/predict the targets ballistic trajectory in case of ABM”

It’s kind of interesting to note that older SAMs like the Nike Hercules and SA-5 had the big fins as they were expected to manuever at the higher altitudes. 45km in the case of Hercules.