If you're only 10 bowls in, it's not surprising that things taste the same. When I drank my first couple of beers, they all tasted pretty much the same to me, but after discovering Belgian Ales, I started to understand the differences between styles, and then the subtler differences within those styles. Same with Scotch, and now Bourbon. If you've spent time developing your palate in other areas, the process will be a little more familiar, but it still takes time.
I started with a few aromatic blends, and an awful lot of them tasted the same to me despite the different aromas in the jars. I took a dive into English blends, and that's where I started to see some of the subtle differences (I picked a sampler that included mild, medium, and strong blends on purpose). I'd smoked these for several months before I tried my first Va/Per blends, and by that time I could tell that there was a difference, though I'd have had a hard time describing it. I'm now 2 years in, and just starting to develop the vocabulary to describe what I'm tasting, and I'm nowhere near the level of other blend poets (such as JimInks), who have been doing this for much longer.
Don't worry about it overmuch - focus on technique to begin with, and try different blends with your focus being on "Do I like this?" rather than trying too hard to tease out the subtle essence of leather and plums that distinguishes a particular blend. It will come in time.