Is there a difference between a total and a sum in Swedish?

I'm not mathematician, but not in colloquial speech.

There's no difference in mathematics in neither Swedish nor English. They both mean the added terms of a sequence of numbers.

So a translation as 'what is the total?' would also be correct?

A moderator will have to confirm that it's in the list of acceptable entries for this sentence, but it's a perfectly okay translation to English, yes.

Here the translations are just sum <> summa.

Well in mathematics you never use the word total.

You are right,in mathematics we usually use ...SUM...

A sum can be also be an addition equation, eg: "do your sums". The total is more specific and it is always used to mean the result, but sum can also mean this.