well, S3C2442 and S3C2442B, just for an example, meet all those criteria: they have same footprint, same family, same pinout, same supply voltage. I leave it as an exercise to readers, why they are not compatible nevertheless, though there hasn't been any hackish involved from EE side.

When you found out, you might start to ponder if same problems might apply to swapping 3430 with a 3630

/j