First things first, there’s no difference between writing a quality policy for an ISO 9001 or an ISO TS29001/API Q1 quality management system. Next, there’s no established or preferred format for writing a quality policy.

Your organization’s quality policy can be as detailed or as brief as your organization chooses to make it. However, it must reflect the purpose of the organization and set the framework for quality objectives and continual improvement of the quality management system.

It’s also important for the quality policy to state the organization’s commitment to its customers, stake holders and to comply with customer, industry (regulatory) and any applicable local, state or federal (statutory) requirements.

Ensure your organization’s quality policy includes reference to the following two key statements:
1. Top management’s commitment to meet requirements.
2. Top management’s commitment to continually improve the effectiveness of the quality management system.

The following is an example of an ISO 9001 or ISO TS29001/API Q1 quality policy.
“ACME Widget Company is committed to providing its customers with products and services that will meet or exceed their expectations for quality, on-time deliveries and value.
Our top management is committed to complying with requirements and continually improving the effectiveness of the quality management system.”
Remember, the bottom line is to write a quality policy that actually describes your organization’s purpose and top management’s commitment to meet requirements and continually improve the effectiveness of the quality management system.
I hope this helps!