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Just had a play in Orbitron...
My guess is (based on your ID of Optus B3) the "another geostat satellite" to the left is JCSAT 4, and the slow moving one above right is Hellas Sat 1 (DFS 3).
Hellas Sat 1's orbit is inclined at 4.561 degrees so that might account for the slow movement you've observed.
Optus B3's orbit is only inclined at 0.009 degrees, and JCSAT 4 is only 0.021 degrees.
Can you find JCSAT 8 further to the right from Optus B3 in your original image? My guess is it could in the FOV...
Al.
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