I have a 2005 forester 2.5l turbo EJ25 engine and just found out it has STI block. I have replaced crank with EJ25 crank. Will it be the same as STI crank ? 

Probably not and your block probably isn't the same as an sti either , the ej257 or 255 in sti trim run a semi closed deck block but I don't think the foresters do . But I maybe wrong

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It is semi open deck block. That makes it EJ257 sti  block right? 

As far as I'm aware the 2.5 ltr crank is the same across the range . As I think there's only 1 type of nitraded crank listed when you use them in a 2ltr block (to make a 2.1 stroker).

You could give the part numbers a cross check on import car parts website to be certain .

in classic 2ltrs it's not the block type that distinguishes it's a sti (they change over the years /versions).

It's the cams ,forged pistons /rods and headgaskets that are uprated but this could be different for the 2.5 as I'm not up to spec on newage

If it's not broke .....upgrade it 😊