How To Identify Losartan Potassium From Its Physical Attributes?

I JUST FILLED MY LOSARTAN POTASSIUM 100MG TABLETS.THE PILLS LOOK NOTHING LIKE MY OTHER TABLETS..I DO REALIZE THERE ARE VARIATIONS OF TABS BUT I CAN NOT FIND A MATCH ON THE ON -LINE PILL IDENTIFIER.I AM AFRAID TO TAKE THEM. THESE ARE WHITE, OVAL AND HAVE 13 ON THEM.THE OTHER TABS WERE OVAL, SMALLER, AND GREEN. HAS A MISTAKE BEEN MADE?