Mark1234,
No, the curves will be different but the result will be the same and for the same reason- a reuction in available thrust as altitude increases due to lower air density.
It is mitigated in a jet as it has more capacity to increase it's rpm up to a limit, but then tails off in a similar fashion.
A piston gets it's power by burning fuel/ air in the cylinders, and gets it's thrust from the prop. A Turbo Fan gets it's power from burning Fuel/air in the combustion stage and MOST of its thrust from the By-pass fan, so the same basic physics apply to both.