Snail ID questions

Is there a simple way to tell Helix pomatia and Cornu aspersum apart? I’ve seen shell measurements used, but what about when you don’t know if the snail’s fully grown yet?

Are there any online guides/keys for Southern European snails?

Thank you!

This website has some helpful differences described:
https://idtools.org/mollusk/index.cfm?packageID=1178&entityID=8221
https://idtools.org/mollusk/index.cfm?packageID=1178&entityID=8207

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