MM 638 VS MM 453

Could anyone give me a comparison between MM 638 Polymer blends and composites (Prof. Arup R. Bhattacharya) and MM 453 Engg. Polymers & Composites of Materials (Prof. Arun Bhattacharya). I need comparison in terms of level of difficulty, nature of professors and subject type (theoretical, mathematical, experimental, etc). Any tips/suggestions would be appreciated. Thanks :)