FINTEH.USDT asset is backed 1:1 by USDT on Ethereum (https://etherscan.io/token/0xdac17f958d2ee523a2206206994597c13d831ec7), and can be deposited and withdrawn using FinTechAssociation's gateway (https://finteh.org).
Tether is a token backed by actual assets, including USD. One Tether equals one underlying unit of the currency backing it, e.g., the U.S. Dollar, and is backed 100% by actual assets in the Tether platform’s reserve account. Being anchored or “tethered” to real world currency, Tether provides protection from the volatility of cryptocurrencies (https://tether.to).