The interchangeability of parts between different model years of the Chevrolet Blazer can vary depending on the specific component and the generation of the Blazer. In general, parts for Blazer models from the same generation are more likely to be interchangeable, while parts from different generations may not be compatible due to differences in design or technology. For example, parts such as brakes, suspension components, and engine parts are likely to be interchangeable between model years of the same generation. This is as long as they have the same engine and drivetrain configuration. However, body panels, interior trim pieces, and electronics may be less interchangeable due to changes in styling and technology. It's always a good idea to consult with a knowledgeable mechanic or parts specialist to determine which parts are interchangeable for a specific repair or upgrade.