Yes ....it would be 100% compatibe with coure...
For Cultus you can use same kit too without advancer emulator or even switch but it is not recommended.
As cultus has distributor, you can advance timing from it mechanically. In that case you car will only be tuned for running good on either CNG or Petrol not both.
without emulator your cars check engine light would remain on.
And with current switch you won't be getting auto conversion from petrol to cng