EEC, Eurasian Economic Commission is a regulatory body similar to Korean KCC or US FCC. Before any product enters the market it needs to be certified. This applies to all electronic devices, including graphics cards.

AMD VEGA 20:

Vega 20 is said to have four HBM2 Stacks, which enables 32GB vram. According to the list from ECC Vega 20 is Radeon Pro/Instinct series.

AMD VEGA 11 and Vega 12:

Vega 11 and Vega 12 are smallest VEGA chip just like if you remember Polaris 12 and Polaris 11, It was meant to replace Polaris according to the leaks. The list below lists Vega 11 XT and Vega 11 PRO for AIBs, There’s also an entry for FirePro card.  There is Vega 12 XT, a model listed as FirePro card

AMD VEGA 10 XTX, XT and XL:

The list confirms codename of enthusiasts Vega 10 lineup. Vega XTX offers more TDP  and then there is Vega XT which offers less TDP than XTX and XL is lowest model (probably for OEM ) . XTX will be launched as a Liquid Cooling as well as air-cooling.

AMD will be showing their whole RX Vega lineup at Siggarph on 30th July, right now take take this as grain of salt. Anything can be changed in last minute. Also Read http://[Rumour] RX Vega Prices Revealed Cost Around 850$

Source: ECC , Reddit