if the engines are the same year, the block and internals should fit. the STI bottom end is stronger than the wrx because of forged componets. I'm not sure if the heads are the same or not though. I think all GC8 and GF8 blockas are all the same really but let someone else confirm
I would also suggest you use the sensors from your old engine as they may be different for an STI engine with an STI ECU.
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