Jewtuszko is a legitimate Polish talent with a ton of promise who needs the requisite experience against relevant competition at the appropriate time in his career to take the next step. Here's his bio from SB Nation:
Born and raised in Szczecin, Poland, Jewtuszko has become of the best lightweight prospects in the region, sporting an undefeated 7-0 record before debuting with the WEC in August of 2010.
He made his Zuffa debut against legitimate striking threat Anthony Njokuani at WEC 50 and absolutely demolished him.
Curt Warburton, on the other hand, is by no means a sub-standard fighter, but it isn't clear he's a legitimate UFC talent either. He went the distance with Spencer Fisher in his UFC debut, but it's difficult to tell what that means in this stage of Fisher's career. There's also a case to be made he's been grandfathered into the UFC because of his Wolfslair association.
Warburton is going to get creamed by one of the best European lightweights competing in the sport today. Jewtuszko by KO.