There is no v1.4 or v2.0 as far as HDMI cable is concerned. Check for "high speed" marked on the HDMI cable. If it mentions high speed, it should support 4K. Currently all available HDMI cables should be high speed only.
V2.0 would only make a difference if you have 4K infrastructure and in such case the equipment (TV, HT, STB, 4K Bluray) would need to have HDMI 2.0 ports. The HDMI cable would remain the same high speed cable.