意思不一定相同的。

come along可以表示比如“ (尤用于鼓励别人参加某活动)来吧,一起来”“加把劲儿 赶快 ”等意思,而along come多表示“随之而来,到来……”

There's a big press launch today and you're most welcome to come along.

今天有一个大型的媒体推介会,非常希望您能光临。

Come along, Osmond. No sense in your standing around.

快点儿,奥斯蒙德,你闲站着干什么。

Along came the Vikings, with their action-man words like drag, ransack, thrust and die.

同时到来的还有北欧海盗,以及他们雷厉风行的词汇,比如拖,掠夺,刺,死亡。

Then, along came the Greek fiscal crisis with the potential of unwinding the progress already achieved.

随后,希腊财政危机爆发,业已取得的成就可能因此一笔勾销。