F28M35x difference between two instructions

I am eager to know the distinction between "AnalogSysctrlRegs.TRIG1SEL.all"  and " Adc1Regs.ADCSOC0CTL.bit.TRIGSEL"  .I konw that AnalogSysctrlRegs.TRIG1SEL is to assign the SOCx source of trigger to ADC,but I am puzzled about the intention of Adc1Regs.ADCSOC0CTL.bit.TRIGSEL.Thank you,my friends.