Is the meaning of these two sentences the same? Are they interchangable?
No. The first sentence responds to his ongoing habit of not telling the truth, the second to a past instance of his not telling the truth -- viz.:
He doesn't tell the truth. I wish he did.
He didn't tell the truth. I wish he had.
Actually, if you really meant to use the past tense ("wished") in the second sentence, it is referring to a time further back in the past from the wish.
I found out that he hadn't told the truth. I wished that he had, but he hadn't.
So, would this sentence be correct? "I wished I had been more handsome in my high school years."
With "had been," I believe the time reference of the wish must technically still be interpreted as being further in the past.
I'm not sure I've understood clearly what you mean above. Could you explain again?
So I don't understand why you see the backshifting of wish to wished as playing an instrumental part here. In what way does backshifting wish to wished 'technically' alter the grounding of the time reference point?
I still see the remoteness in sentence b) as between the present moment and that moment, and not between that moment and a previous moment, as you seem to be suggesting, if I understand you right.
The problem is whether had been after wished must refer to a time earlier than wished or whether it can refer to a time contemporaneous with wished. If it can refer to a time contemporaneous with wished, does that imply that it would be wrong to use were for that time reference? Or could either be used?
Basically, is backshift meaningless after wished?
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