I don't think it would make any difference.
The problem is, shipping rates from the United States to Hong Kong (or to anywhere else overseas) are high. And they are almost certainly MUCH higher than shipping rates from Hong Kong to the United States, based on some amazingly low purchases I've made from vendors there. So it's quite possible that U.S. Acura dealers are simply passing along the shipping rates they have to pay, which anyone who bought the parts and shipped them to you would also have to pay.
You can look up rates for shipping from the United States to Hong Kong on the websites for the
United States Postal Service as well as
FedEx and
UPS, although in my experience the latter two consistently cost more for overseas shipments. For example, let's say you have a package of parts that weighs 5 pounds. The minimum charge for shipping that package through the post office is $47.95, plus $3-6 for insurance.
Rates are less for small parts, but the package must be under 4 pounds. And even then it's probably going to cost $20-30 or so for shipping, unless you're talking about something truly light weight (a few ounces in a padded envelope).
For small parts purchases, you're almost certainly better off buying them from a dealer in HK, because of the shipping. Large parts will depend on the trade-off of savings on the purchase vs higher shipping rates, but as you can see, anything of significant weight is going to be expensive to ship. In which case, having someone do it for you rather than having the dealer do it isn't going to make much difference.