Will 94 suburban doors fit a 89 Chevy truck?

No, 94 suburban doors will not fit a 89 Chevy truck. The door designs and mounting points differ between these models, as they were produced in different generations with distinct body styles. Modifications may be possible, but it would require significant alterations to make them compatible. It's best to use doors specifically designed for the 89 Chevy truck for a proper fit.