Boots definitely has nowhere near the range that it has in the UK and the medications it carries are different to the UK - but all the other bath/shower stuff etc is exactly the same that you buy anywhere else!
I would assume the Marks and Spencers products are almost the same as they sell in their other stores worldwide - it wouldn't make sense for them to make different things to only retail here in the gulf - surely that wouldn't be cost effective for them as a company.