Squawk7777
I don't know.
There is no reason why they should be, as the airspeed limitations are a function of the airspeed structural limits rather than the type of power plant used to achieve them.
Thats why installing ecxess HP without a general and certified beefing up of the airframe, is interesting only for the rate of acceleration to the relevant speeds and higher climb rates.
Higher Cruise speeds are limited to the original VNO/VNE with perhaps a VA as the limit in any turbulance again unless there has been a certification ugrade to the airframe and controls.
It means you can cruise at speeds at or closer to these limits than you may have been able to with the std HP, but as always there is a price. Especially in the C210.
Putting a 5.7 litre Chevy in your Toyota Corrolla might get you going a bit faster in a straight line but the handling would be something else.
In any event it should be in the AFM if you have access to one.?