The boundaries between the Indian and the Somali plate and the one between the Indian and the Eurasian plates, are different types of boundaries, thus the land forms differ from one another.
The boundary between the Indian and the Somali plate is a divergent plate boundary. The land forms that appear on and around the boundary are dominated by rift valleys and steep mountains and hills that have been cut/separated because of the divergence.
The boundary between the Indian and the Eurasian plates is a convergent boundary between two continental plates. In here, both plates push against each other, creating a lot of pressure on the land, so the land has been lifting up continuously for several million years, creating the Himalayan Mountain Range which dominates the landscape.