They aren't. The U.K.'s Seasons are just advertised differently. They are the same episodes as aired in the U.S.
In fact, the U.K. is actually behind in the episode airings. The episodes have already aired in the U.S. by the time they air overseas.
If by chance you're referring to the DVD sets, They aren't as well.
They are simply named a season ahead but they are the same episodes that air in the states.
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This episode is called 'The Tan Aquatic with Steve Zissou' and it's from UK season 6, which is US season 5.
It's called 'Baby Not on Board' (US season 7/UK season 8)
In a cutaway on the DVD version of the episode 'The Former Life of Brain' (UK season 8/US season 6)
In 'The Juice is Loose' (UK Season 8/US Season 7) Peter says, "Nick Jonas is so cute." Hope this helps!
The episode's called 'Boys Do Cry' (UK Season 5/US Season 4), where Peter says: "Imagination Land, where you burp where you fart and you fart where you burp!"