Simply put, cash refers to foreign currency in the form of electronic or bills, such as foreign currency deposits/remittances in bank accounts, foreign currency checks, drafts, etc. Cash is the foreign currency cash in your hand, including foreign currency notes and coins.
Choosing cash or cash for dollar repayment means that you are prepared to pay off dollar debt in cash or cash. If you have enough US dollars in your bank account or a US dollar check in your hand, you can directly transfer the money for repayment. At this time, you can pay it back in cash. If you have enough dollars in cash, you can repay it directly in cash, and then you can repay it in cash. The two repayment forms mainly depend on whether you like transfer or cash repayment, but the forms are different, and there is no essential difference, because it is a dollar debt, and the amount is the same whether it is cash or cash repayment.
The difference between cash and cash will only appear when it is converted into local currency. Because cash is far superior to cash in many aspects such as storage, custody and transfer, cash is more valuable than cash in conversion.