“把 A 改为 B”应该翻译成“change A to B”，而“把 A 折合成/兑换成 B”应该翻译成用“change A into B”，两者不可混淆。

例：

交货期改为 5 月并将人民币折合成美元。

Both parties agree that change the time of shipment to June and change Renminbi into US dollar.