I managed to get the Ursa Minor one to look alright again, although I had to edit Ghost1.png a bit and make a Scatterer config.
I uploaded the edited Ghost1.png here: https://imgur.com/VWYlUoq.png
I went to GameData\Scatterer\config\Sunflares\Sun and replaced Ghost2.png, Ghost3.png, SunFlare.png and sunSpikes.png with the ones from the Ursa Minor pack. I replaced Ghost1.png with the edited one linked above. Then I went to GameData\Scatterer\config\Sunflares and replaced the Sun.cfg with the attached config I made.
Ends up looking like this, not exactly the same but I think it's looks pretty good:
Scatterer_sunflare
{
Sun
{
syntaxVersion = 2
flareColor = 1.0,1.0,1.0
flares
{
Item
{
texture = scatterer/config/Sunflares/Sun/sunFlare.png
displayAspectRatio = 1
scaleCurve
{
key = 1 5 0 -0.200
key = 55 1.05 -0.007 -0.0012
key = 2500 0.2 0 0
}
intensityCurve
{
key = 2 0.0 0 0
key = 11 0.6 0 0
}
}
Item
{
texture = scatterer/config/Sunflares/Sun/sunSpikes.png
displayAspectRatio = 1
scaleCurve
{
key = 1 5 0 -0.200
key = 55 1.05 -0.007 -0.0012
key = 2500 0.0 0 0
}
intensityCurve
{
key = 2 0.0 0 0
key = 11 0.6 0 0
}
}
}
ghosts
{
Item
{
texture = scatterer/config/Sunflares/Sun/Ghost1.png
intensityCurve
{
key = 2 0.0 0 0
key = 11 1 0 0
key = 500 1 0 0
key = 2500 0 0 0
}
instances
{
Item
{
intensityMultiplier = 0.1
displayAspectRatio = 0.56
scale = 1
sunToScreenCenterPosition = 0.9
}
}
}
Item
{
texture = scatterer/config/Sunflares/Sun/Ghost2.png
intensityCurve
{
key = 2 0 0 0
key = 11 1 0 0
key = 500 1 0 0
key = 2500 0 0 0
}
instances
{
Item
{
intensityMultiplier = 0.001
displayAspectRatio = 1
scale = 0.222
sunToScreenCenterPosition = -0.12
}
Item
{
intensityMultiplier = 0.5
displayAspectRatio = 1
scale = 0.125
sunToScreenCenterPosition = 0.2
}
Item
{
intensityMultiplier = 0.4
displayAspectRatio = 1
scale = 0.1667
sunToScreenCenterPosition = 0.4
}
Item
{
intensityMultiplier = 0.35
displayAspectRatio = 1
scale = 0.2
sunToScreenCenterPosition = 0.6
}
}
}
Item
{
texture = scatterer/config/Sunflares/Sun/Ghost3.png
intensityCurve
{
key = 2 0 0 0
key = 11 1 0 0
key = 500 1 0 0
key = 2500 0 0 0
}
instances
{
Item
{
intensityMultiplier = 0.001
displayAspectRatio = 1
scale = 0.222
sunToScreenCenterPosition = -0.16
}
Item
{
intensityMultiplier = 0.5
displayAspectRatio = 1
scale = 0.125
sunToScreenCenterPosition = 0.22
}
Item
{
intensityMultiplier = 0.3
displayAspectRatio = 1
scale = 0.1667
sunToScreenCenterPosition = 0.43
}
Item
{
intensityMultiplier = 0.15
displayAspectRatio = 1
scale = 0.2
sunToScreenCenterPosition = 0.64
}
}
}
}
}
}