Do we have any proof of different cover art ?
This kind of release (Jordi Savall / Astrée) is very unlikely to have multiples editions, that was a small label. It was sold to Naïve in 1998, but i don’t think they ever re-released those.
It was released for the 20 years of the orchestra (formed in 1974).
Amazon (US/UK/FR) shows tons of shit about it, i managed to get another barcode 0329845637838 from ASINs but original release date is set to 1978 … and this barcode gives no result on google…
Imho that’s one release. I would merge 3 to 1 and do a clean up, adding your own scans.