instead of和rather than在用法上有什么不同

instead of
instead of
prep.（介词）
In place of; rather than:
代替；宁愿：
ordered chicken instead of fish.
点了鸡而不是鱼
ather than
rather than
conj.（连接词）
And not:
而不是…,而非…：
“Gibson guitars—with their carved tops and necks that are fitted and glued to the body,rather than bolted on—are expensive to make”(Joshua Rosenbaum)
“制造吉伯逊吉他非常昂贵——精雕的顶端和颈部被安装且黏到吉他主体,而不是被锁上”(乔舒亚·罗森鲍姆)
prep.（介词）
Instead of:
而非…,替代…：
“diseases in which the immune system plays the villain rather than the protector”(Sandra Blakeslee)
“免疫系统在疾病中扮演的是坏蛋的角色,而非保护者”(桑德拉·布莱克斯利)