Majha
The partition split the Punjab Province (British India) into the two states of West Punjab (Punjab, Pakistan) and East Punjab. However, the historic Majha region is arguably still the same as before since the partition does not change the previous history of Punjab, therefore does not change the geography of the Majha region of the historic Punjab region.
Mohali
After the partition of India in 1947, the former British province of Punjab was also split between (mostly Sikh) east Punjab in India and (mostly Muslim) west Punjab in Pakistan. The Indian Punjab required a new capital city to replace Lahore, which became part of Pakistan during partition. Consequently, the government carved out Chandigarh of nearly 50 Pwadhi speaking villages of the then state of East Punjab, India.