Not sure how they “simulated” these vaccines efficiency. If all big pharmas data looks alike, does it means they just generate trial data using the same softwa

Not sure how they “simulated” these vaccines efficiency. If all big pharmas data looks alike, does it means they just generate trial data using the same software, while russians did it in some other app? Btw can we “simulate” how much deaths were in each group? Or “simulation” is not working that way?