The scp command is a Unix-based utility, so it will not work on Windows systems directly. However, there are alternative tools that you can use to copy files between remote servers on Windows. One popular option is to use the free, open-source tool "PuTTY." PuTTY provides a suite of utilities, including pscp, which works similarly to scp and allows you to securely copy files between remote servers.

Regarding the question of whether files will be overwritten, scp does not automatically overwrite existing files. If you want to overwrite files, you can use the -f (force) flag:

scp -rf userA@serverA:/path/to/source/directory userB@serverB:/path/to/destination

Note that using the -f flag can be dangerous as it will overwrite existing files without asking for confirmation. It's always a good idea to make a backup of important files before using scp with the -f flag.
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