What is the difference between the purushvaachak sarvanam and nishchayavaachak sarvanam

Purushvaachak means in english personal pronouns. In hindi we can say that jab hum pani baat karte hai ya fir kisi dusre ki baat kart or hum jab samne Vale ko kisi tisre ki baat karte hai to unhe purushvaachak sarvanam kehte hai. FOR EX- MAI GARDEN JAAUNGA. TUM GARDEN ANNA. KAL VAH MUJHE MILA THA.