Bravo!
Were the two barrels the same length? 0.090" is a big difference, almost 1/10". The neatest way so you don't have to do any soldering and rebluing the barrel is to call Ruger CS (336) 949-5200 to get just a new front blade w/o the base WITH A CROSS PIN, and ask for the tallest they make like for the .45 Colt (.440" high). They'll send any parts less than $20 for free and one blade is about $8. They are for stainless guns which have a stainless sight base and a blue blade pinned in a milled slot.
You can cut the blade off, neatly level the surface, cut a 1/2 moon slot if you have a little skill with a Dremel tool using a carborundum cut off wheel. Make it snug so you a slight "interference" or "press" fit and drive the blade in with a brass punch. That may be all you have to do, or clamp sight in the groove, drill thru and install pin. Or have the slot milled locally.
Or ask for the whole sight base with blade $9 so it's also free, and also a singles six front sight screw. Cut and grind off the old sight being very neat when you get down close to the barrel bluing using tape. Drill and tap the barrel, and drill and countersink the sight (like on the Single sixes) and screw sight on. Ruger's front sights are silver brazed on and take so much heat to remove, the bluing is ruined on the front half of the barrel.
Any questions just ask,
Jim