Only by editing your Windows Registry.
The sessions are stored in [HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions]
Export your colored stored session to a .reg
file.
Filter the .reg
file only to the Colour*
and *Font*
entries.
Clone whole .reg
file contents (except for a header) for each session you want to modify.
Edit section names to names of the sessions you want to modify.
Import back.
Your .reg
file will look like:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions\Session you want to modify 1]
"Colour0"="187,187,187"
"Colour1"="255,255,255"
"Colour2"="0,0,0"
...
[HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\Sessions\Session you want to modify 2]
"Colour0"="187,187,187"
"Colour1"="255,255,255"
"Colour2"="0,0,0"
...
...
1Beat me to it, well played. I was looking for similar for KiTTy (I don't use PuTTy) and they're all stored in Computer\HKEY_CURRENT_USER\Software\9bis.com\KiTTY\Sessions\ – spikey_richie – 2018-10-31T13:51:27.717