Greetings from the Florida Panhandle
First off, welcome to the Forums. We're glad to have you with us.
As to the published weight differences, it's anybody's guess. They may have added a feature or gotten a heavier piece of wood that day. We are talking about a company here whose 27' trailer is longer than its 28' trailer. Go figure.
Also, I have found that actual real world tongue weights are generally substantially higher than those published on the spec sheets.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2020 Silverado 2500 (Vivian)