No, you cannot use the same database schema name for different environment of ALM PC.

If you use the same database schema name for two different ALM/PC instances of the same version (ALM/PC 12.55), they will become one environment.

If you use the same database machine for both of your different ALM/PC environment (not recommended) , the database schemas names must be unique for each ALM/PC environment.

IMPORTANT: They must be on same version. You cannot use different versions of ALM/PC environments.

Example: Environment1 ALM/PC 12.20, Environment 2 ALM/PC 12.55 as this would cause database corruption.