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The internal make the biggest difference, the benefit of bigger tyres are compromised on the narrower internal of the Open Pro (needing to pump them up higher to reduced that squrimy feel), the Open Pro AFAIK is 14mm internal (give or take), whether the A319 is a whopping 19mm internal.
Having said that, cyclocross rider for the last several decades have been riding big tyres on tiny rims, so it's not that big a deal breaker, though the early CX rider rode at a tiny 28mm!
edscoble
@veLLo
Your rim was definitely wider than 19mm. I measured the open pro CD last night and they are just under 20mm wide (measured with a Made in France caliper)