Well...I did say 'exactly', not 'mostly'.
The newer cloning tools do not care about actual drive size, but rather the actual used space.
90GB used space on a 2TB drive will happily clone into a 120GB SSD.
However, in the cloning process, you mostly do not get to pick and choose what gets cloned.
The Samsung Data Migration gives you the option to leave off files like doc/video/music/pics. Other than that, everything else goes.
There is no checkbox for 'this, but not that'.
Do you have another drive? An external, maybe?
Bottom line, though...to clone into a 120GB SSD, you need to get the actual used space to below 1000GB.