Remove validation data from train dataset

I have my validation and train dataset and I am trying to remove the validation dataset that exists in the train dataset and create a new subset.

val_data = data from a previous experiment
train_data = current training data
new_data = data from train_data the does not include val_data

I am trying to get the new_data Please how do I go about it?

NOTE: I am not using train test to generate the validation dataset because it was already generated beforehand