Standard nozzle are too small and don't fit. There are one or two 3rd party vendors which made replacement nozzles, but I don't recommend it. Why? Because the problem is that the core is very fragile and you have to tighten the nozzle very hard back into the core. If you don't do that, the risk that filament comes out on the upper part of the nozzle is high and in that case you can fill and damage your whole print head. In other cases, the print core breaks when you screw the nozzle in.
And to answer the question about AA 0.4 and AA 0.8. You can adjust the line width in Cura, that's usually enough, but there us also a way to reprogram the Core to an AA 0.8. Search the forum for instructions, it is only a special gcode.
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Carbon 28
As far as I know, you can't buy the "nozzle only" you HAVE to buy a new extruder.
We've experienced this, and rectified it by using a wire off a "Wire Brush"......yes a wire brush, heating the nozzle to operating temp, then pushing the wire through the nozzle hole then did a HOT and COLD pull, it now works a treat. 👍
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