A Query, Suman kalyanpur's version songs Options

[sbfan]

Hi friends

as we all know that Suman kalyanpur's first break was Mangu 1956 md Mohammed shafi/OP Nayyar.but i had learnt that she had sung version songs from shabnam md 1949 md sd burman


Pyar Me Tumne Dhokha Sikha-----Suman Kalyanpur, Mukund
Tera Mera Pyar Kya-------Suman Kalyanpur
Ye Duniya Roop Ki Chor Pt.I-------Suman Kalyanpur
Ye Duniya Roop Ki Chor Pt.II--------Suman Kalyanpur

it is mentioned at

http://www.downmelodylane.com/version.html

if she could get the version songs in 1949 of sd burman why did her career started from mangu .
do add

regards
ashish