The TH K4AT is the UHF version of the TH K2 2 meter handheld and is almost identical in appearance....Only the colour of the print on the buttons and the colour of the power switch differ.
The TH F5 is also a UHF version of an identical 2 meter set.
So, both 'real' but the F5 is made in China by Xiamen Comms Central Co., Ltd....As to whether it is a genuine K/W is debatable, as it does have that 'lack of detail' look about it that Chinese radios can suffer from....and the the rotary control knob on the top certainly looks a lot more Chinese than Japanese!
Regards, Neil.