be designated to
be designed to
请问这两者有什么区别?

参考:
The men were designated to take the islands prior to the main invasion.
The bombardments were designed to destroy the beach guns.

【1】designate: 选派, 任命,指派；
be designated to （某（些）人）被指派/任命为...
主语一定是人！（除非是童话故事。拟人化除外）
【某人被指定/被指派做某事，或执行任务，或担任职务】
He designated Smith as his successor.
他指定史密斯为他的继承人。
He was designated by the President as the next Secretary of State.
他被总统任命为新国务卿。

The men were designated to take the islands prior to the main invasion.
这些人被指派在大举入侵前占据那些岛屿。

【2】design 计划。企图；图谋；构思；谋划
be designed to : 某（东西，物，计划，图谋，或者）被计划用于...
主语一般是物。人不应该被计划或者设计来做某事。

The bombardments were designed to destroy the beach guns.
炮击用来摧毁滩头堡垒。