Thanks to a forum member from Sweden, I have been able to add these two banknotes to my (very small) collection.
Yes, both notes are circulated. But they are both difficult ''gets'' even in circulated condition, not to mention unc.
The 20kr is from the D0-subseries. The third digit from the left indicates the subseries. The first two digits from the left indicate the place on the sheet. The remaining digits are the sheet number.
As the 20kr notes usually enter circulation via shops and stores (and not ATMs) it's difficult to get them in unc these days. Most 20kr notes are from the B0 and B1 series.
The 100kr note is from the B0-subseries. According to an expert who is much more knowledgeable than I am the number of 100kr B0 notes is very low. It's estimated that less than 200.000 B0 notes were printed. The vast majority of the 100kr notes are from the C0 and C1 series and too a lesser extend the D0 series.
Bottom line: Even if it's a circulated note I am very happy to add this 100kr note (and the 20kr) to my collection.