I went to Sweden and they made very little distinction between and AS & A-level qualifications, classifying them both as Level 4\D. The soul reason I got into my course was because I met the Mathematics requirement (4) with my AS at grade C
So yes, international applicantions may put weight on AS qualifications if you have them. Whether the grade matters... it's always good to aim high but in the case of Sweden the criteria for their admissions was more so how many qualifications you have at at a certain level, in what subject. And as long as the grade was "a passing grade", no forther consideration was made as per the exact grade since the mentality was you reached a minimum threshold of understanding meriting the qualification level.