What are these double prices on voyages-sncf.com?

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I'm checking the train connections between Amsterdam and Strasbourg on Vojages-snfc.com and for each travel they offer 2 options. See the screenshot, there is a price in red and green but I don't understand what's the difference.
Could you help me ?
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Is it cheaper to buy TGV tickets in advance?
TGV high-speed trains, yes. TGV high-speed trains are all-reserved. All tickets for these trains come with a seat reservation automatically included and the price varies like air fares, so pre-book for the cheapest prices.Is it cheaper buying train tickets on the day?
Is an Advance On The Day ticket cheapest on the day? An Advance On The Day ticket (when available) is cheaper than both the Off-Peak and Anytime tickets brought on the same day.How do you finesse train tickets?
What is the difference between SNCF and oui?
So Oui SNCF is an online travel agency (also called OTA in English for Online Travel Agency), specialized in train and bus tickets booking. SNCF train tickets. The small difference is that it is a subsidiary of SNCF.La Machine à voyager by Voyages-sncf.com
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Images: Antony Trivet, Max Vakhtbovych, Silver Works, Rachel Claire