Hello, how can we know if a record is really changed(not load and save, must have something changed) in an user event script aftersubmit function? Is it possible to compare context.newRecord and context.oldRecord?

it is possible with NFT, at least for those fields defined on the record class in question.

Thanks for your answer! NFT - Netsuite-fasttrack-tookkit? Would rather using standard Netsuite function if it is possible.

I would wager the code you write to do this with plain NS will be more fragile than NFT, but I wish you best of luck!

To answer your original question, there is not a native function that magically compares oldRecord vs newRecord. The implementation is so case dependent that it doesn't really make sense for NS to provide that natively via their APIs