HA! I have never done that with Screagle.
Never had Screagle from Magnum either, only 750. But I do have experience with 750 and magnum with other producers - Togni, Spottswoode, Beaucastel rouge, etc. If you haven't done so before, do try it for yourself. Do it blind for some friends. I'll bet that most would think they are different wines. (If they are good tasters, they will probably guess same wine but different vintage.) Ahhh.....blind tastings are so humbling. I did one once for customers that included a mid-90s Groth cab and it's reserve as well as a Yellow tail Shiraz and it's reserve. Of the 20 or so tasters, the consensus was that America loves Yellow Tail. (Where's the emoji with it's hand smacking it's forehead?!?!?!)