Net Factor Income to Abroad:
Net Factor Income to Abroad (NFIA) refers to the difference between the income earned by a country's domestic factors of production (i.e. labor and capital) from foreign sources and the income earned by foreign factors of production from domestic sources. In other words, it represents the net flow of income between a country and the rest of the world.

Components of NFIA:
- Income earned by domestic factors of production from foreign sources (e.g. wages and salaries earned by workers employed by foreign companies)
- Income earned by foreign factors of production from domestic sources (e.g. profits earned by foreign companies operating in the country)
- The difference between the two (i.e. net income flow)

Net Current Transfers to Abroad:
Net Current Transfers to Abroad (NCTA) refer to the net flow of current transfers (i.e. payments made without any expectation of receiving a return) between a country and the rest of the world. It represents the difference between the amount of transfers received by a country from abroad and the amount of transfers it makes to other countries.

Components of NCTA:
- Current transfers received from abroad (e.g. remittances from overseas workers, foreign aid, etc.)
- Current transfers made to other countries (e.g. foreign aid given to other countries, contributions to international organizations, etc.)
- The difference between the two (i.e. net current transfer flow)

Key Differences:
While both NFIA and NCTA represent the net flow of income and transfers respectively between a country and the rest of the world, there are some key differences between the two:
- NFIA deals with income flows while NCTA deals with transfer flows.
- NFIA includes income earned by factors of production while NCTA includes only current transfers.
- NFIA can be either positive or negative depending on whether a country earns more income from foreign sources than it pays out to foreign factors of production or vice versa. NCTA, on the other hand, is always positive if a country receives more transfers from abroad than it makes to other countries and negative if the opposite is true.