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Both circuits are exactly the same, just drawn a bit different. Look sharp.That is precisely what I don't find in the circuit from the book.
Finally, does it matter in what order the different stages of a multistage filter are connected? Each stage would be a 2 pole or 3 pole filter.
Certainly Sallen-Key
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The positive feedback's purpose is to create the filter, but would not that affect the stability ? Or can be used as a simple filter with no restrictions ?
It depends. The filter with negative feedback factor of 1 is unconditionally stable because the positive feedback is always smaller than the negative. Sallen key filters with gain can become unstable with unsuitable RC values (not implementing a useful filter characteristic).