In a word - no. Very few UTV programmes made it to STV although perhaps a few more made it the other way. But remember that when UTV began, it was only ever projected as a station producing a few hours a week of purely local programming, whereas STV always had ambitions for its material to be seen furth of Scotland - as it indeed was from almost the start with John Grierson's weekly "This Wonderful World".
However as the years wore on, UTV occasionally made something that STV picked up on, but usually in the 13-minute filler* category like Roger Whittaker's series "Thirsty Boots". Much later (when I was there), STV's Planning & Presentation chief was an ex-UTV announcer, Brian Durkin, but he didn't seem too inclined to buy/schedule much from his former employers.
* there were a number of problems involved in fitting the late night ITN Headlines into the schedule. ITN obligingly repeated the bulletin (live) a couple of times to accomodate different regional patterns, but there was clearly a physical limit to that, so companies would pad up to the news with short fillers. "Golf with Dow Finsterwald" was one such delight....
The views expressed on this forum are entirely my own.