It depends on the slug. I have not come up with an easy solution yet, but I run linklint link checks to come up with the blogger urls against the existing site, then compare. In some cases there are only a few.

Blogger, for example will remove articles like ‘a’, ‘an’ and ‘the’ – and also appear to be limited to 38 characters.

So it will turn for example: A Good Day To “Swim” into good-day-to-swim (that’s an example I just made up). WordPress may accept the existing urls, but you may need to add them back.

Like I said, I haven’t found a consistent way to handle that yet, it’s a pain and laborious. There are some plugins for WordPress that can tweak the default slug for new posts, but I have not seen a way to run through existing ones.

But you can look at your existing archive filenames and then cross check those, changing the slugs inside the Edit Post window.