Thobh Vandan is a form of Guru Vandan, specifically the Panchaang Pranipaat type of respectful bowing to Sadhu-Sadhviji or Guru Bhagwants. It is counted among the three main types of Guru Vandan. ( jainonline.org)
Takeaway
So, in simple words: Thobh Vandan = Panchaang Pranipaat Guru Vandan. ( oshwal.org.uk)