I have avoided the Citori Upland Special because of the 24" bbl, but this one has 26" bbl, which I have never seen before.
I do like the standard hunting model stock measurements better. What is the weight difference of 12ga Hunting model vs Upland?
26" barrels and straight grip stock sounds an awful lot like the Superlight model. Have you checked the serial number to determine if it an Upland Special? I would do that for a definitive determination as there have been special order runs for some distributors with mixed features or stamping. I have not seen nor heard of stamping one model for a different model with Browning yet but I would not be surprised in the least.
Listed gun weights are as reliable as the listed weight on a driver's license. I don't usually think of weight except in a very general way. Balance is a much more critical factor for me as a light, poorly balanced gun is much more of a pain to carry and difficult to hit with than one that is properly proportioned to me. A basic rule of thumb with "standard" 12 ga bore diameter is to figure one ounce of weight per inch of barrel length. For a double barrel that would be doubled naturally. The stock is a real problem as wood weights vary greatly depending on the grain, density, dryness, etc. comparing two different models has even more variables though the shorter, straight gripped SHOULD weigh less due to having less wood than a longer pistol grip model but the amount could vary from negligible to a quarter pound or so.
I do not like the Citoris because they are so rough to open/close. The Superposeds are a good bit more money but are as smooth as butter...
Give a Citori 45+ years of use and it will smooth out quite a bit too. As much as I fell for the mystique of the Superposed, I have grown to prefer the Citori for a myriad of reasons. The good point regarding the Superposed today is that the prices are dropping like rocks and one can find the standard models for not much more than a comparable Citori.