Toupe to Power is quite a step.
The Toupe is a narrow and fairly long saddle, power wide and short. The Power will sit 2-3mm forward of the Toupe and although the rail positions differ saddle to saddle you might want to check you don’t need a seatpost with less offset or indeed straight to make the Power work.
That said the Power is designed based around the whole position rotating forwards (saddle forward, bars down and potentially forward, along with shallow reach drops). That isn’t to say it won’t work, but it won’t feel anything like a toupe without some fettling.
A Romin is a nice halfway house that seems to work for a lot of people. IIRC it will sit in virtually same position on the rails and may even be as simple putting nose in same place as the Toupe (distance from bars and stack height, noting rails and saddle thickness can differ model to model).