Yeah obviously specialization is possible in case of Integrated MSc. The only difference is that if you have integrated MSc then you need not have to sit for any entrance exam for MSc. Also Integrated MSc syllabus are kind of hybridized and are different from BSc Course.

So if you want you can go for integrated MSc there will be no prob regarding specialization. You can specialize in both the cases.

I hope my answer helps. All the very best for your future endeavors!