项目负责人和项目经理是项目管理中两个不同的角色，他们在项目中承担不同的职责和角色。

项目负责人是项目的最高决策者和决策执行者，负责项目的整体规划、组织、协调和控制。项目负责人通常是项目的发起人或项目的最高领导，他们对项目的目标、范围、资源和进度等方面负有最终决策权和责任。项目负责人需要与项目干系人进行沟通和协调，确保项目能够按照预期目标顺利实施。

项目经理是项目的执行者和管理者，负责项目的具体实施和管理。项目经理通常由项目负责人任命或招聘，他们负责项目的日常运作，包括项目计划制定、资源调配、进度控制、风险管理、团队协调等。项目经理需要具备良好的组织和沟通能力，能够有效地管理项目团队，确保项目按照计划和要求顺利完成。

总的来说，项目负责人是项目的决策者和决策执行者，负责项目的整体规划和控制；而项目经理是项目的执行者和管理者，负责项目的具体实施和管理。两者在项目中密切合作，共同推动项目的顺利进行。

In addition to the differences mentioned earlier, there are a few more distinctions between a project sponsor and a project manager:

1. Authority: The project sponsor holds the ultimate authority and decision-making power for the project. They have the ability to allocate resources, approve budgets, and make critical decisions. On the other hand, the project manager has limited authority and operates within the boundaries set by the project sponsor. They are responsible for executing the project plan and managing the day-to-day activities.

2. Stakeholder management: The project sponsor is responsible for managing the project's stakeholders, including identifying key stakeholders, engaging with them, and addressing their concerns. They act as a bridge between the project team and the stakeholders, ensuring that their expectations are met. The project manager, on the other hand, focuses more on managing the project team and ensuring that they have the necessary resources and support to complete their tasks.

3. Risk management: While both the project sponsor and project manager are involved in risk management, their roles differ. The project sponsor takes a higher-level view of risks and focuses on strategic risks that may impact the project's success. They make decisions regarding risk tolerance and risk response strategies. The project manager, on the other hand, is responsible for identifying and assessing risks at a more operational level. They develop risk mitigation plans and monitor risks throughout the project's lifecycle.

4. Communication: The project sponsor plays a crucial role in project communication, especially with senior management and other key stakeholders. They provide project updates, seek approvals, and communicate the project's progress and achievements. The project manager, on the other hand, is responsible for day-to-day communication within the project team. They ensure that team members are informed about project goals, tasks, and deadlines.

In summary, the project sponsor is the project's ultimate decision-maker and is responsible for strategic aspects, stakeholder management, and overall project success. The project manager, on the other hand, is responsible for executing the project plan, managing the project team, and ensuring that the project is completed on time and within budget.