So, I decided to find a type that different function 1/function 2 subtypes could possibly relate to most. I will be using my own type as an example.
Most agree that a Ti-INTj is more similar to a ISTj, but it has been debated before whether or not a Ne-INTj is more similar to an INFj or ENTp. Now, you could argue for both, but I would argue that if the Ti-Ne axis for the 2-subtype system were a dichotomy rather than a sliding continuum, a "pure" Ti-INTj may occasionally resemble an ISTj, while a "pure" Ne-INTj may occasionally resemble an ENFp.
(are these inert/contact subtypes? something like that?)
This is based on the theory that in the (inert?) subtype, functions 1,4,6, and 7 are strengthened, in this case logic and sensation, and with a leading introverted rational function the "resemblance" type of ISTj is produced.
Likewise, in the (contact?) subtype, functions 2,3,5, and 8 are strengthened, in this case intuition and ethics, and with a leading extroverted irrational function the "resemblance" type of ENFp is produced.