Similiar Object for Different Use

I have 2 model classes called Assessment.

Assessment for MainActivity :

data class Assessment(
    val title: String,
    var workouts: List<Workout>
)

Assessment for JourneyActivity :

data class Assessment(
    val title: String,
    val imageUrl: String,
    var workouts: List<Workout>
)

those class is instantiate from retrofit response

I am wondering should i make it 2 different class or i use JourneyActivity.Assessment in MainActivity and ignoring variable imageUrl? which 1 is the best way?