I'm curious to know the compression value you measured in the cylinder that wasn't damaged.
Pretty sure you can replace just the reed itself, not sure the unbroken or otherwise good cage needs replacing (judgement call based on wear)? I would certainly replace both reeds, they're probably well worn and near end of life.
2-stroke carburetor issues often result in engine failures due to piston overheating - How well was the engine performing before the failure occurred? Often if one or both carburetors are internally dirty, this will cause the engine to hesitate at part throttle. Hesitation and lean stalling are an indicator of a lean fuel mixture which will lead to piston damage.
It's unclear how your engine failed, if there was a piston meltdown or just something broke but if there was any performance issues or regardless anyway, I would overhaul the carburetors and clean them well, internally. An overhaul should include replacing the 2.0 needle and seats, and probably gaskets, possibly the round rubber metering diaphragm, depending on how they feel and look (should be nearly as soft as rose pedals and no pinholes).
Don't replace the carburetor metering springs or other parts that aren't obviously worn or damaged, original OEM springs are best so keep them. Concentrate on cleaning out the small passages, especially important if engine was hesitating from a lean air: fuel mixture.
You'll need to align the new engine position, a special alignment fixture is required.
New fuel lines if not recent, 1/4" and 5/16" ID fuel line, also the small oil lines are 5/32"ID Tygon F-4040-A
Good luck!
