I doubt it... It mixes both left & right & passes on the bass to the amp, the same as the 8033s would. It has to mix & output a mono channel after all.
The thing is you need to use one that accepts both channels, no point in just connecting one after all
So the 8033s would do the job & then feed mono bass to your sub. The sub only mixes & adds the two together the same as the 8033s would. But if you didn't use the 8033s to mix them both you'd need two 8033c & then feed each to the sub
Costs more, is more complex & damn stupid if you ask me
Hope that helps