For many years, all Side Impact Crash Test studies have been put into practice considering the results achieved from the EuroSID II dummy. The introduction of the WorldSID to the crash test world has become a milestone not only for vehicle manufacturers but also for crash test laboratories. Because of this, it is necessary to study the differences between the EuroSID II and the new dummy to be used from now on in Euro NCAP Side Impact Tests, the WorldSID.To do this, an in-depth analysis of the structure of both dummies was carried out so as to obtain a clearer view of what can be expected of the values achieved from testing them. Furthermore, a series of impact tests were defined, based on side impact virtual tests, making a special effort to obtain crash test results from both dummies in very similar configurations.By comparing the impact that side impact crashes can have on the individuals, it will be possible to discern if there are any weaknesses in the Passive Safety developments that have been made up to date.Crash test laboratories and vehicle manufacturers must promptly adapt to the upcoming European Passive Safety Protocols. The availability of a clear result in the comparison between the EuroSID II and the WorldSID will enable future Vehicle Passive Safety Analysis to be directed towards the correct path, ensuring an improvement in the biomechanical values and lowering the amount of injury risks that are subject to any kind of side impact crash.