Rsync + SSH + Cygwin64 don't work (Ok with Cygwin 32bits)

Question

First of all, sorry for my bad english, I do not speak well this language.

I have been using rsync (v3.1.1) + ssh for several years, from cygwin (32 bits), as a stand-alone program, directly from the Windows command line. It works perfectly, with command lines like this:

rsync.exe --info=progress2 -h -rlt --chmod=a=rw,Da+x --delete --delete-excluded -v --no-i-r -z --compress-level=9 -e "./ssh -o StrictHostKeyChecking=no -o Compression=no -p 22 -i 'myKeyFile'" --password-file="myRsyncPasswordFile" "/cygdrive/C/mySourcePath/" "login@rsyncServer::myRsyncModule/myBackupFolder/"

I wanted to use the binaries compiled in 64 bits of Cygwin, and there, it does not work anymore (I kept the same version of rsync: v3.1.1). Rsync always asks for the SSH password instead of using the private key, and the password is not recognized.

Specifically, the following command works very well:

./ssh -o StrictHostKeyChecking=no -o Compression=no -p 22 -i 'myKeyFile' login@rsyncServer

But not the rsync command with ssh inside "-e" parameter.

Would anyone have an idea of the origin of this problem?

I remember that the goal is to use it in standalone mode, without the need to install cygwin on the PC (and it works very well in 32 bits)