I couldn't tell if you were interested in swapping a body of the same size, perhaps with better/more jointing or if you wanted to move up to a larger, more proportional body.
I don't have any Pullips so I can't speak for skin tone matches. However, most Obitsus come in what Obitsu calls "white skin", sometimes translated as "whitey". Obitsu white skin is a very close match to Volks normal. Many more dolls compare their skin tones to the Volks colors.
The body in the Zirconmermaid tutorial is a white skin Obitsu 60cm.