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Dark lipped Cepaea nemoralis (on left) and pale-lipped Cepaea hortensis, yeah? No - both are C. nemoralis! See reply to see how they looked a couple of days later.
Lip colour and size is the conventional way to identify the two species, but it does not always work, especially in some regions (Cornwall, UK; Pyrenees, Spain), and depending upon age. There are also a lot of snails labelled "C. hortensis" on #iNaturalist that are more likely C. nemoralis. #snails #snail #cepaea
These are the same snails on day 4 and day 8. The lip of the yellow snail has become pigmented some days after the lip has formed. Unfortunately, this late pigmenting leads to misidentified individuals. In real life, the lip is probably still soft when just formed, so you could recognise it as just-adult but this is difficult to tell from a photo, hence lots of confusion on #iNaturalist.
@snailman interesting, we introduced only brown-lipped to our garden from a few streets away, and I saw this individual the other day and was reluctant to id as white-lipped
@snailman Hi! What kind of species are those snails??
@moramacbeath Cepaea nemoralis, aka grove snail 
@snailman what are you working on?? I would love to know!!