I guess:
Transmit SNR= transmitted power without any attenuation/thermal noise power in the transmitter electronic circuit.
Receive SNR= received power/end-to-end total noise
If the transmit power is the power with any thermal noise or attenuation then why do we say "Transmit SNR", because SNR means "Signal-to-Noise ration, if the transmit side does't have any noise then why to use this term.
Typically SNR is not measured at the transmit mode, instead we do measure TX EVM. In the receive mode we do measure SNR and it is combined effect of channel attenuation and all kind of noise including fixed point error.