To a non-Muslim, the difference between Mohamed and Mohammed might not be readily apparent. Perhaps it doesn’t go beyond the spellings, but there must be some significance.
Journalists who occasionally get such name spellings wrong receive a lot of flak, which stresses the need to always pay attention to the smallest details in names. If you think this doesn’t matter much, try writing your name with that extra letter at the start, middle or end. For example Chaagema, Chagemma or Chaggema.