俱舍論疏 17.64

17.64

論「依不異心至決判應知」，依不異心造二業說。若異心自作兩業，究竟必異。

The treatise says, "Relying on the absence of a different mind [...] should be known as a definite determination": this is spoken relying on performing two karmas without a different mind. If one performs two karmas by oneself with different minds, their completion must be different.