There are many, many methodologies for Change Management out there — Clayton Christensen's - Jobs to be Done, Potter, Appreciative Inquiry, and more. Literally, thousands of books have been written on the subjects of digital transformation. Despite what the pundits and large consulting firms might say. No one size fits all.
In the end, it takes experience to determine which methodology will work best for each engagement. That said, there are a number of universal processes that apply to each engagement, and they are not unfamiliar ones.
No matter how you approach it. Change and digital-enabled business transformation begin and end with engaged collaboration. Sessions that help both the consultant and the stakeholders understand the complexities of the issues at hand as well as to learn that strategy and data are part of a solution that crosses departmental boundaries. Factors that are essential to the overall long-term health of the organization and the success of the transformation.