No. The microarchitectures have some notable similarities and cross-pollinate each other, but they are distinct.
You may be thinking of IBM i (formerly known as AS/400 and i5), which has a completely abstracted instruction set that on modern systems is internally recompiled to Power.
You may be thinking of IBM i (formerly known as AS/400 and i5), which has a completely abstracted instruction set that on modern systems is internally recompiled to Power.