*Is order guaranteed?*

For any map m, 

(= m (zipmap (keys m) (vals m)))


... is guaranteed. 

But, for two maps m1 and m2, 

(= m1 m2)

... does *not* imply

(= (seq m1) (seq m2))

*Which version to prefer?*

It's worth looking at what the Clojure Cookbook does 
<https://github.com/clojure-cookbook/clojure-cookbook/blob/master/02_composite-data/2-21_applying-functions-to.asciidoc>.
 
It uses both patterns, only expanding for into map in the second one. But 
none of their functions quite matches your case, which I think it would 
express using zipmap. 

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