The difference between the Ti-Ne (INTPs) & the Ni-Te (INTJs) ways of coming up with constructs and forms filled with substance has that quirkily different way of manifesting itself where the leading Ti versus the supportive Te (in combination with their respective Ns) 'practically' demonstrates the difference you've pointed out and the similarity with INFPs. Experiencing this similarity/difference is almost fascinating.
the difference between INTP/INTJ = TiNe v/s NiTe, &
the difference between INFP/ENFP = FiNe v/s NeFi, &
the similarity between INTP/INFP = TiNe cf FiNe