Do 89 and a 90 ford probe parts engine interchange?

No, 1989 and 1990 Ford Probe parts, especially engine parts, are not completely interchangeable. While there may be some overlap in parts, there were significant changes between the 1989 and 1990 model years. These changes could affect engines, transmissions, and other components. You'd need to check the specific part numbers to be sure of compatibility. Using a parts database specific to Ford Probes from those years would be the best approach.