even if they have similar components, look at the differences.

the colours are way more saturated to give a less realistic and dreamlike feel.

it's framed as just observing the expanse of cloud and the boatperson fishing, through a window. In contrast the journey through the sky the album cover invokes by having the boatperson actively paddling and facing towards the horizon.

endless sea implies a purposeless drifting while river connotates a persistent forward momentum which I think fit the narrative of respective pieces well.