Plug in the numbers here.
https://tiresize.com/comparison/If you scroll down a bit there is a link to calculate the true axle ratio with bigger tires and what new gears you need to match factory.
Back in the day most factory trucks came with 28-30" tires. Going to 33 or 35" tires was a pretty big jump. But today most trucks have somewhere around 32"-33" tires from the factory. It just isn't that much of a difference to go to 33 or 34" tires. Even 35's. With most swaps you only see about 3 mph difference at 70. Less at slower speeds. I wouldn't worry about re-programing anything unless you go 37" or bigger.
Another thing to keep in mind. Tires get smaller as they are used. With 40,000 miles on them they are about 1 size smaller than when they were new. If you program your speedometer to be right when the tires are new, it won't be right later. If you leave it alone it may be off a bit when the tires are new but will become more accurate as you wear down the tires.
Because of this around 2-3 mph is about as accurate as your speedometer can be from the factory. No one is going to write you a ticket for being 3 mph over. In fact, here in GA in MOST cases they can't write a ticket until you're 11 over. There are exceptions, school and construction zones for example. GSP can write them at less than 11, but unless you're doing something else stupid they leave you alone until you're 11 or more over the limit.