Combination wye w/ side inlet IPC

According to IPC quarter bends with side inlets can be used to drain a water closet and an additional fixture. Is the same true for combination wye and 1/8 bend with side inlet? Can i use either one of these in place of the side inlet quarter bend? Notice that the inlet in the second pic is located at the center of the wye. If i added an 1/8 bend to the wye it would not be the same fitting as the first combination fitting.

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