Tyres for winter

Sports combi 2002 / 3.0 TID in my vehicle license are 205/65 R 15 registered as rim size. I have original Saab rims 195/65 R15T (but I think I only have 110 KW of diesel but has 130 KW of diesel) can I use the rims or do I / can I have them registered or are there any other concerns?