The bottom line is this accident was not caused by differential power, it was caused by the crew electing to continue to repeatedly fly an approach when the the conditions were not suitable and critically to fly below approach minimums without the required visual references.
There were many contributing factors here but IMO the lesson to be learned for those pilots doing the hard flying in crappy little T-Props for Sh*yte operators is; "you have to keep your safety margins intact". You will likely face almost irresistible pressure to cut corners, but it is up to you to resist those pressures. This accident is, sadly, one more in a long, long list of avoidable tragedies.
The smartest move I ever made in my whole flying career was to walk away from a terrible operator. Not too long after I left they were shut down by the authorities after a fatal crash of a Metro in bad weather.........