I've been doing some reading and I came across some alternate stats for a few things such as weapons and vehicles.
For the weapons, I found a few things with differences in damage dice, crit multipliers and ranges, and weight. I figured just go with the more recently published book.
As for Vehicles:
Galley costs 30,000 gp in the Core Rulebook
Then 10,000 gp in Ultimate Combat
both descriptions are about the same except Ultimate Combat's being more detailed, and with a non-rowing option.
Keelboat costs 3,000 gp in the Core Rulebook
Then 13,000 gp in Ultimate Combat.
The only major difference is carrying capacity. The expensive one can carry 40-50 tons, and the expensive one can carry 1,000 lbs. A difference of 39.55 tons. Between the two, the cheaper version can carry more weight, which makes no sense since it should be a property that increases it's value, not decrease.
If I go by the publication date idea...
Core Rulebook 1st Print -> Ultimate Combat -> Core Rulebook 5th Print
Ultimate Combat came between the different erattas of the Core Rulebook, but the Core Rulebook never modified the prices of the two vehicles.