I would recommend to sample the image from both DataLoaders and compare the output values.
If dataset1 is a subset of dataset2, the absolute error should be zero, since the same image would be loaded and processed in the same way (assuming that you are not using random transformations).
Your current implementations of conf.dataset and CIFAR10Noise are not defined.
Feel free to post the code for both methods, so that we could have a look at them.