they are not synonyms as-

population growth- it means population is growing

population control- it means the population is in control

POPULATION GROWTH : 1. Population growth is the difference between birth rate and death rate plus migrations. 2. It is expressesld in percentage. 3. Growth rate was 2.14% per yearvas pervcensus in1991. It has declined to 1.93% per year in 2001 POPULATION CHANGE : 1. Population change is the number of people added to the total population in a year. 2. It is ecpressed in the addition of number of people.3. Population was 84.64 crores in 1991. It increased to 102.87 crore in 2001 and addition of 18.2 crores in a decade. No they are not synonyms.
Plz mark it as best... if u admit it.