How to integrate different data struct into one ? Any design pattern or exprience?

As you know, differenct vendor may have differenct name of data field. Although the name is difference, the data struct is almost the same. For example,

struct s1 { int s1Price, int s1Volume }

struct s2 { int s2Price, int s2Volume }

Like stock market data, the data would sent to program automatically, and the program just receives the data and then processes it.

I want to design a program which can easily change to other vendor's data struct.

If I develop program with s1, sometime later, I want to change to s2 with smallest change.

I hope you can get my point.

Could you give me any advice ? Any design patter or your exprience ?