1) Not even close. SMS is transmitting for a fraction of a second, while a voice call is transmitting for the duration of the call.
B) People whose physiology is within several standard deviations of the norm do not sent text messages with the phone held right next to their skulls.
Of course all the apps running in the background and GPS features are also just running for fractions of seconds and so on radio is radio and cancer occurs in places other than one’s head - radio is radio and the effects are cumulative.