That's interesting because mine were more dark-coloured when they were younger, now they are brighter. Yours were more brighter and they became darker

Looking at the pictures won't tell You much, because those are photos of dead specimens. And looking at the colours is not the best way to identify. Look at the comparison picture from T.R. Roberts' "Fishes of Borneo"

It shows the general difference. And that's not a colour or body shape, but the width of the stripes. As we know both species have pale and dark bands. And as T.R. Roberts writes about
S. hymenophysa:
12-14 pale bands with very dark margins on a slightly dark background
... and about
S. reversa:
Body with about 12 complex vertical bars consisting of alternating pale and dark bands separated by darker thin vertical streaks; as dark bands generally somewhat wider than pale ones, effect is of 12-13 dark bands with very dark margins on a pale background (reverse of pattern seen in B. hymenophysa).
IMHO there's no doubt that it is not a
S. hymenophysa 
You can also take an attempt to check the number of branched dorsal fin rays. It should be 9-11 for reversa and 12-13 for hymenophysa.
Pufff, that's amazing, that keeping loaches makes You a permanent loach-detective
