FindSpectraPpmShift[spectra,{dw,gyro},peaks]

finds the ppm value that aligns the spectra with the given peak positions peaks wich is a list of ppm values.

FindSpectraPpmShift[spectra,{dw,gyro},{peaks,amps}]

finds the ppm value that aligns the spectra with the given peak positions peaks wich is a list of ppm values and amps are ther relative amplitudes.

FindSpectraPpmShift[spectra,{dw,gyro},specTar]

finds the ppm value that aligns the spectra with the given target spectra specTar.