They were both released at the same time, but I don't think HLJ (for obvious reasons) isn't going to carry export market one. I'm not sure what online retailers will sell Aoshima stuff (Tower Hobbies only lists 3 kits). There's always eBay I guess, but the kits need to get on our shores first. I say by-pass it and get the JDM one instead, it's the one with the entire engine, rather than a chunk of block and some top-end parts.
Well looks like I will be getting then, since the one is already paid for and in transit to me