keep up with与catch up with都可以用在 ‘我赶上了某人成绩’（抽象）和‘我赶上了一辆巴士’（具体）这种抽象意义上的'赶上'和具体意义的'赶上'吗?或者有区别?

keep up with =catch up with
赶上,这两个的区别在于keep up with,追赶人与被追赶人所处情况差不多,
而catch up with暗示追赶人处于落后地位.
通俗的讲
keep up with 跟着.跟上.保持不落后的状态.
catch up with.赶上.强调要上前赶