Fitness is specific. Fitness is very specific. This means that if you want to be a marathon runner you have to train specifically for that and if you want to be a sprinter, you have train specifically for that. You can't do the same training for a marathon and expect to be an extremely fast sprinter. Your training must be specific to your goals. Sure, training for both of these will make you more fit, have more energy and increase your leg strength, but only when you specifically train for one or the other do you become truly great at it.
Preparing for change is the same. If you are to successfully navigate changes in life then you need to train specifically to handle those changes. Sure, you may get better at change by going through a big change, or getting mentoring or counselling for something in particular, but the process of change has a very particular structure. The different parts of the change process can all be targeted and developed. You can get fit for each of the stages of change in the same that you can get fit for a marathon, a sprint or a world strongman competition!