Better to have copied ALL the files under .../mysql/. Plus make sure you have the same (or nearly so) my.cnf (my.ini)

mysql/data/mysql/ contains grant info

innodb_... settings are critical to understanding and/or rebuilding logs, etc.

Several files are critical to replication (which you probably don't have).

Copy all the files, _then_ start mysql. It should be fooled into thinking it is picking up where it left off.