Hi Judy, there are only a few differences with the models
WRT311FZDT- Bigger cubic foot, humidity controlled crispers which the other one does not.
WRT519SZDT- 1 additional door bin and Electronic Temperature Control.
Hopefully this information is beneficial to you. Thank you for your inquiry regarding our Whirlpool appliances!
8 years, 4 months ago
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WhirlpoolTeam