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Welcome to Ice in Space Peter!
The sensor in the Ultrastar C is/has been used in many an astro cam previously, although if you're looking to do some long exposure DSO imaging I'd recommend you get a camera with a cooled sensor.
The ASI224 is very sensitive - if you are looking to try something different, it can be quite effective with lucky imaging where the thermal noise takes less of a grip, and using such a technique you could probably forego the cooling.
Another point to consider is that while the two cameras have more or less the same resolution, their pixel sizes are quite different, which results in a very different FOV. The Ultrastar will cover almost 4x the area of sky (assuming the same scope), at the cost of being able to resolve smaller details.
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