*The ceramic filter caps at C10+C11 in the C64 play an important part in the filter offset point – regardless of the actual fitted SID
The 6581 and 8580 SID chips differ from each other in several ways:[https://en.wikipedia.org/wiki/MOS_Technology_6581 Source]
*The original 6581 was manufactured using the older NMOS process, which used 12V DC to operate. The 6581 is very sensitive to static discharge and if they weren't handled properly the filters would stop working, explaining the large number of dead 6581s in the market.
*The 8580 was made using the HMOS-II process, which requires less power (9V DC), and therefore makes the IC run cooler. The 8580 is thus far more durable than the 6581. Also, due to more stable waveform generators, the bit-mixing effects are less noticeable and thus the combined waveforms come close to matching the original SID specification (which stated that they will be combined as a binary AND).