What is the difference between those formula calculating the interest rate parity, please give an example if possible.

Predicts change in foreign exchange rate caused by the difference in nominal interest rates between home (h) and abroad (f): (1 + rn). Ft = forward-rate for time t, So = spot-rate at time 0, rh = home nominal rate, If = foreign nominal rate. Ft so rh - rf (1 + r) So