Possibility of using different resolution input data over smaller areas

[Afshinshafei]

I have a very general question, which is not clear to me, about this method. and sorry if my question is very basic because I am a noobie in this field.

I ran the code and got the results for the same datasets used inside the paper (ERA5 res 30km) for different dates.
Can I use higher res data (2km) for the smaller area too? and need to train the whole model from the scratch or I can use the checkpoints provided in the paper to run the code for higher-resolution datasets?
Thank you very much for your time! :)