How do you handle risks in change management when stakeholders disagree on potential impacts?

When managing a high complexity, fast paced IT project, there are times when stakeholders do not align or disagree on the potential risks and business impacts of a proposed change.

With tight timelines and significant technical complexity, the delivery team may be reluctant to implement the change due to concerns about unpredictable consequences in the future state.

As a project manager, what strategies would you use to align stakeholders, build a shared understanding of the risks and business impacts and support informed decision-making?