It is quite possible that the culture works the same with a gift.
It would have probably changed only marginally the results, but then Spullla would have used a few more units to kill the remaining of HRE stack, and possibly would have to put some 'defenders' inside the city otherwise it would/ could be razed during HRE turn. (And/Or would be slightly more exposed to a possible counter - even if HRE has no reserve, Spulla doesn't know for sure)
Edit - just for confirmation, from Spullla last picture, there are 14 (!) Danstki muskets defending the city (and therefore protecting Spulla Cavalries and generals)
It would have probably changed only marginally the results, but then Spullla would have used a few more units to kill the remaining of HRE stack, and possibly would have to put some 'defenders' inside the city otherwise it would/ could be razed during HRE turn. (And/Or would be slightly more exposed to a possible counter - even if HRE has no reserve, Spulla doesn't know for sure)
Edit - just for confirmation, from Spullla last picture, there are 14 (!) Danstki muskets defending the city (and therefore protecting Spulla Cavalries and generals)