Deformation twins are of much smaller thickness (normally submicron scale), besides planarity of their coupled boundaries may be more or less disturbed due to proceeding deformation by lattice  dislocations or new twins.  For the same reason (if you have appropriate tools) disorientations slightly deviate from ideal ones. 

Use texrture analysis (X-ray or EBSD) and you can identify them (including their volume) by their appropriate misorientation to their parent grain (deformed or recrystallized). See my PhD and Habilitation thesis and papers on RG.