Answer:
(Fatwa: 364/311=D/1430)
As silver and gold can be dealt in with difference, in the same way a currency can be exchanged with another currency with difference. So, in cases when the currency rate is higher it is lawful to send it and get the extra amount.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
