Shipment to be made in two lots 与…in two shipment的区别

是不是总数的区别？例如一共有10，Shipment to be made in two lots 表示运20；in two shipment表示一次运5，两次运完？

国外来证中规定：“Shipment to be made in two lots.”或“Shipment to be made in two shipments.”两者都译为“分两批装运”，但在实际业务中对二者的理解却不大相同，因而在具体做法上也不大相同。对于“Shipment to be made in two lots.”发货人可将同一合同的货物装在同一航次的同一船上，不过须分别作两套单据。对于“Shipment to be made in two shipments”，发货人必须将货物分装在两条不同的船上或不同航次的同一船上。