Will 1998 - 2001 Cadillac Catera wheels fit on a or newer Impala?

No, 1998-2001 Cadillac Catera wheels are very unlikely to fit a 2000 or newer Chevrolet Impala. While both are GM vehicles, they have different bolt patterns (the number of lug nuts and their spacing), wheel offsets, and potentially different hub bore sizes. These differences would prevent the Catera wheels from mounting safely and correctly on the Impala. Using wheels with an incorrect bolt pattern is extremely dangerous.