There is solution for this problem.
From the machine where existing putty connection are available we can extract the details. The following steps are to be followed.
Step 1: Windows –> Start –> Run –> regedit
Step2: Navigate in Register Editor –> My Computer –> HKEY_CURRENT_USER –> Software –> Simon Tatham –> Right Click –> Export –> Save as Simon Tatham.reg
Step3: Copy this file Simon Tatham.reg to the new machine.
Step4: Run this Simon Tatham.reg in the new machine the settings will be available.