Vita Audio changed changed its name to Ruark in 2012, I think for international branding reasons. Initially, the Vita and Ruark units were identical. However, all the Ruark units have been updated, sometimes more than once.
Therefore, all Vita Audio units are now at least eight years old and not the same as current models and as you would expect much cheaper.
Ruark was formed in 1985 and were known for their high quality speakers, which are still well regarded today. They have changed direction to make radios and small audio units and no longer make large hi fi speakers.
Like Grumpsimus said, Ruark originally put out their single box radios/music systems under the Vita Audio brand before re-branding them as Ruark Audio. At the point they re-branded, the Vita and Ruark models were afaik identical, bar the name on the front. Since then, however, Ruark have updated the various models (the current R1, R2 and R4 are the mark 3 versions), mainly to include more modern functions (streaming, bluetooth etc).
So, if you're looking at a new Ruark R1 (mark 3), then it won't be identical to a Vita Audio R1 but a mark 2 Ruark R1 would be identical to a mark 2 Vita R1.