the way china usually counterfeits these ICs is picking any one with the same pin count (in the case of the CXA1145, DIP-28), sometimes desoldered from a working system, filing away the original markings and etching the counterfeit IC number onto it. The chips I have are very obviously fakes, but since the pinouts seem more or less ok (R G and B pins all have the same resistance values, for example, and not a different random pinout) it might be pin-compatible.