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INA188: 关于TIDA-00834E2(001)_Sch的疑问

Part Number: INA188
Other Parts Discussed in Thread: OPA2188

上图为INA188应用案例的电路图 从上图理解 我觉得是对输入信号用仪表放大器INA188和精密放大器分别做了处理,这样的做的目的是为了比较二者信号处理的差异吗?

在INA188中,RG = 5.06K,因此增益等于1+(50K/5.06K)= 10.88

OPA2188电路的增益为10.17

这两个增益并不相等,看起来差的相对多些,这是为什么呢