It would be a pity to set this condenser in place, weld everything up, pull a good evac, weigh in the charge, only to go hit the disconnect and the compressor is dead meat.
Has this unit sat with no refrigerant and open to the atmosphere? If so, chances are good the insides are loaded with moisture. Compressor oil is hydroscopic (mineral not as bad as POE but still it'll grab at water). Also, when inside unit suffered fire, did it open system to contaminants from fire? When the indoor unit was removed, did they just cut the lines (sunshine recovery) and haul it off, leaving the lineset open?
At worst, if the compressor still runs, you may be faced with a considerable cleanup effort to ensure this thing doesn't die before you can buy your new condenser. And then you'd want to be sure the system was once again cleaned (in addition to a good evac) when you go to change out the condenser again.
You can undersize indoor coil but I wouldn't think of it without a TXV.
Psychrometrics: the very foundation of HVAC. A comfort troubleshooter's best friend.