The melody from the beginning of the track Nihilist — Sunbeam From Fornax 4 (1994) was borrowed by the duo TransWave for their track TransWave — Adoration To The Aum (1995). Whether TransWave did this intentionally or accidentally is unknown to me.
Two tracks: Icon (2009) and Eikon (2020) by RA.
The first one is classic oldschool goa trance. The second is some kind of hybrid between psy-prog and new school goa. The track titles themselves kind of suggest that one is a remix of the other. However, because of the pumping psy-prog groove, the melodic similarity is not immediately obvious. But it is there — and the 2020 track is in fact a remix.
Listen to the very beginning of the first track.
Then listen to the second track from the start.
Then play the first track from 01:46, and the second track from 06:05.
RA — Icon (2009)
RA — Eikon (2020)
Both tracks are in the goa trance style. But Sunstorm by Aeternum is more melodic. It even sounds like a remix of a track by Fractal Glider.
Fractal Glider - Goa Len (Remix) (1999)
Æturnum — Sunstorm (2000)