how validate linearzed model with respect to nonlinear model

If I have a differential equation of nonlinear model. And Jacobian of that , then how to validate the linearised model?

How to check that the linearised model is how much % fit.

Please help

[Arkadiy Turevskiy]

are you talking about a Simulink model?

[abhijit kulkarni]

If one is simulink and other is real time

Or If one is m file and other is real time