Yes and no. Ostrava, as a huge industrial center, had an unique mix of ethnicities (Czech, German, Jewish, Slovak, Galician, Silesian, Polish etc.) that interacted and created a mixed language. As a result, the dialect is different from the one used in the Silesian countryside. There is a lot of very specific words that probably weren't used in the original agricultural setting of Silesia (such as "papaláš", meaning a high-ranking official).

And reading collections of old Silesian folklore from the villages, I noticed the rustic language having some extra features no longer present in Ostrava as well.

But the staccato accent is pretty much the same, yes. As is the preserved pronunciation of hard "y" which died out in standard Czech some 600 years ago.