Is there a diffrent betwen the 1.6L and the 2.0L optra ?

[nefary]

hi all
I need to make an engine swap . I have a 2009 chevrolet aveo . 1.5L sohc . very bad performance . I hope that I gain more power . I read about that the 1.6 L e-tec2 engine which found in the aveo . fits into optra perfectly . with no modifications . I knew a seller who import cars from north america . he imported many aveos . which equipped with 1.6L engine . and he sell the engines to optra owners . and they swap it perfectly .
I know that optra in north america have a 2.0L engine .
is that mean that I can swap this engine directly to my 2009 1.5L aveo? . and if yes I have my car with manual transmission . what will I need to swap the engine with auto trans ?
I want to make a clean job . no need for modifications . no small parts missed . you all know that there are many small parts will be hard to be found

I am waiting your feedback