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For CSD19534Q5A, we would need some time to export the model to TINA-TI. Once done, I'll notify in this thread and you can then download it from its product folder.
To answer your other question, we can compare the datasheets of both the parts to find their fundamental differences.
On doing it, we found that drain-to-source resistance and trans-conductance are slightly higher in CSD19534KCS. Otherwise, both parts look similar. Please find links to datasheets of both parts for your reference.
