Hi , there is a way moving installed games in other unit ( from HD to SSD) withouh reinstalling all again.
if Yes how.

imho just copy the files and modify the links and it should be fine

Depends on the game. Some can be moved without problems, others require a new installation, or at least they have to be run with admin rights to update the registry. You'll have to try it out yourself for your games.

Copy them from HD over to SSD; see if that works and boot straight-up.

If not, might have to do some more things.

As people have said: some games need to be put in the registry and actually need to be installed.

Also, some games might need some of the additional stuff like PhysX files installed, which come in some of these games' GOG offline installers or by doing the install process via Galaxy.

If you do have Galaxy and are fine w/ using it - after doing the copying process; sign-in and boot into Galaxy; highlight game from your Library (that you copied); go to additional options and make it find your install by pointing to it (telling where you copied it). That should complete the install process.

i've moved files, no issue, though i don't have any multiplayer like games & haven't really used galaxy