Ultrafast report!!!
Asset: Duplicate Asset Names
 
Select Top 1000000 t.*
From (Select e.AssetID,
e.AssetName,
e.Assettype,
e.Mac,
e.Username,
e.Userdomain,
e.Domain,
e.FQDN,
e.IPAddress,
e.OScode,
e.Firstseen,
e.Lastseen,
e.Lasttried,
Count(1) Over (Partition By Replace(e.AssetName, '.your_domain.loc',
'')) cnt
From tblAssets e) t
Where t.cnt > 1
Order By t.AssetName
 
Custom version for multiple domains and set of assettypes (windows, hyper-v, vmware, linux)
 
Select Top 1000000 t.*
From (Select e.AssetID,
      e.AssetName,
      e.Assettype,
      e.Mac,
      e.Username,
      e.Userdomain,
      e.Domain,
      e.FQDN,
      e.IPAddress,
      e.OScode,
      e.Firstseen,
      e.Lastseen,
      e.Lasttried,
      Count(1) Over (Partition By Replace(Replace(e.AssetName, '.1domain.loc', ''),
      '.2domain.loc', '')) cnt
    From tblAssets e
    Where e.assettype In ( -1, 11, 92, 70)) t
Where t.cnt > 1
Order By t.AssetName