What is the difference between IPv4 and IPv6 service quality?

What is the difference between IPv4 and IPv6 service quality?
This is an interesting question that people often ask. The two versions of the Protocol have no difference in terms of service quality. The only difference is that the header is slightly different. Therefore, you can use different fields or headers (Extended Headers ). For example, refer to the definition of the DS Field in RFC 2474 for IPv4 and IPv6 headers. This definition details the different service fields of the two versions of the IP protocol.
Below are the fields and headers of the basic IPv6 Technical Specifications Terms of Service Quality: Communication categories, traffic tags, routing extension headers, and hop-by-hop extension headers.