Switching Roles & Differences

Recently I have been asked why I performed distinct roles, and which were the differences between them?

It is well known for a positive person with attitude and eager to learn and support rest of the team or project, choose to execute different roles , this is not new, I met people that changed from ´hat to hat´ in order to facilitate project continuation and that is one of the challenges that actually large corporations or enterprises or companies globally are facing. Ideally is one person performing what was on his/her job description but in some latitudes, projects are so critical that should not be paused thus deployment on flexibility is excellent if success on implementation is the goal. I am sure could be plenty reasons for the organization or individually optional for performing role and changing as strategy but in my case helped me to build a new and better team player. So here they are differences between Project Manager, Solution Architect, Consultant & Pre Sales and skills or abilities were highlighted in yellow to emphasize connection dots or links among them. Would you switch your role? What would you add?