Chugging Along

I'm learning the notes on the D string and A string, which are the last two on the right and I have to say I'm starting to get them confused with the violin notes. The Viola notes are completely different from the Violin ones because for example, open D string on the Viola would be played as the note "C" or two fingers on the A string for the Violin and all of the A string notes for the Viola would be played on the E string for the Violin. The difference between the Viola and the Violin is it's lowest string is the C string and it doesn't posses an E string, the highest. The Viola's lowest string is G, which the Viola has, but it's highest is E, which the Viola doesn't obtain. The order of the Viola strings from lowest to highest is: C, G, D, A, and the Violin's order is: G, D, A, E. That is why everything is a shift and it gets confusing along the way to learn notes that I am already familiar with but they are played differently on a new instrument.