I'm searching for a noun (a single word if possible) or phrase that conveys that one thing functions the same as another externally, even though the internals may differ.
Nouns such as copy, a clone, duplicate, or substitute capture only part of my meaning. Additionally, these words often have a negative connotation; they imply that the thing is derived and possibly inferior. But I don't want to imply that the other thing is derived or merely copied.
What might be some good words or phrases that give a positive connotation, perhaps giving a sense of rethinking, "re-invention", or possibly renewal? I don't need the word to necessarily signify that the new thing is alive, but I want to avoid implying that it is 'lesser'.
Here is an example sentence:
LEG, a recent upstart in the electronics industry, has released the Tintium line of microprocessors, a [?] of Intel's Pentium line of processors. It behaves identically, but since it uses tin-arsenide for its substrate, the chips offer better reliability, especially for interstellar applications. The chip design is open source; several industry experts claim its internals are simpler and more efficient than the Pentium.
And another:
After losing his biological leg, Alan sought the services of Biocraft LLC, who custom designed and attached a [?] of his original limb. The company says it will outlast the natural leg.
Best Answer
The word analogue lacks a negative connotation and appears to convey your intended meaning well.
In your example sentences:
"...released the Tintium line of microprocessors, an analogue of Intel's Pentium line."
"...sought the services of Biocraft LLC, who custom designed and attached a prosthetic analogue of his original limb."