is the avengers and avengers assemble the same film
Yes, it is classified under the name Marvel Avengers Assemble in the United Kingdom and Ireland
The Avengers (2012 film)
Marvel's The Avengers (classified under the name Marvel Avengers Assemble in the United Kingdom and Ireland), 
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The Avengers (2012 film) [SEP] Introduction
Marvel's The Avengers (classified under the name Marvel Avengers Assemble in the United Kingdom and Ireland), or simply The Avengers, is a 2012 American superhero film based on the Marvel Comics superhero team of the same name. Produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures, it is the sixth film in the Marvel Cinematic Universe (MCU). Written and directed by Joss Whedon, it features an ensemble cast including Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, and Jeremy Renner as the Avengers, alongside Tom Hiddleston, Clark Gregg, Cobie Smulders, Stellan Skarsgård, and Samuel L.