Are the civic and the integra suspensive interchangable? Are the spring rates the same?

 

spring rates are different.

front shocks bolt up, the rears are different.

 

Front suspension is similar, and all integra parts will bolt onto an EK. The Integra front brakes are bigger than the EK ones, and will require a larger master cylinder.

As for the rears, the EK has longer/skinnier LCAs and cannot be swaped. That also means the fork at the bottom of the EK rear shocks is skinnier, and will not swap eiither. To put the Integra rear discs on an EK with drums, you'll need the proportioning valve from any 96-00 hatchback or 99-00 Si. You will also need e-brake cables that will fit your chassis (research).

Using Integra springs on an EK, may result in an awkward ride height. You should just buy lowering springs & use your stock EK shocks...