We couldn't forget game tips, which will help you maybe to win your match or whole tournament. Wireless keyboards could be disconnected from operation unit or you have issues with an USB port.
If you experience any kind of problems or errors, check your device status, reinstall game or keep updated all your drivers and operating system. Buttons are divided to groups when you have control over the ball or player is trying to tackle an opponent. Players can control basic movement directions, shooting, defence, varios types of passes, replay actions and special skills which sometimes needs to push combination of keys at the same time and depends on players level. On the top tab, there's option to change inputs and bind specific keys to actions. For PES 2019 keyboard control adjustment, find settings.exe file in directory where you have installed all files (only for Windows users). Player can assign one or more controllers for chosen team before starting match, during team pick, if you forget to select side, pause match anytime you want. Game preferences can be changed after startup via menu and system settings.
What's the main gameplay difference between these two ? Probably the best feature is possibility to use sticks and controll better players movement, button push during shooting (power gauage), it's faster and if you use wireless gamepad, also more comfortable, just lay down and enjoy soccer.
Main reason could be that the game always shows only gamepad as default device with no help popups. From the beginning of Pro Evolution Soccer series, it's quite struggling to set easily PC keyboard controls.