Since what you call one and two part and others know as eye and fork must always be paired, eye to fork, never eye to eye or fork to fork, I can't understand your question. It it's eye on the tang it's fork on the cable and visa versa.
It's more normal for the forks to be on the cable rather than the chain plate or mast tang for simplicity of manufactoring but hardly always, especially with the large number of fork mast tangs one finds made up from, as your terminology correctly puts it, two parts.
G'luck
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