So, the yellow one started as a naturally aspirated multifuel that was "turboed " at some point. That large turbo is off an LDS465-1A. It is impressive, but the D-turbo (the smaller non whistler) is more effective.
I'd look at the casting forward and below of the data plate for the TD letters indicating a stronger "thick deck" block and use that one.
I'd also look at the head gasket for signs of whether an antique or a new style is installed. Paranoid me would probably do headgaskets while the engine is out, as well as the rear main and clutch but that's me!
Up to your taste which turbo you want to install; both turbos work on either engine.
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