yeah, based on what vent said, just about every allo residency will accept the AOA TY for PGY1. a lot of allo residency programs match for PGY2 and beyond. many allo students still do an internship or a categorical prelim. anesthesia is a good example, most people match for PGY2, many allo students would prolly do a categorical surgery prelim for their PGY1, but osteo students can get their AOA TRI out of the way instead. ophtho in the SF match is the same way. for the most part those programs that start PGY2 don't even care where or what you're doing the prelim year as long as its something legit.
of course there are some programs out there that let you start PGY1 or prefer you do your prelim year at their site. a la these are "combined programs". its my observation though that most of the programs are not designed like this. at least for these types of programs (anesthesia, gen. surg, ophtho, etc.).
this is probably where people can get into some trouble with the AOA. when they already have matched an AOA TRI, but also end up matching allo for something somewhere else that would let them or even want them to do their PGY1 on site as well. based on what dr.mom said, this is when the AOA bites back and won't dually approve the allo residency program as a waiver for the TRI, since these people will have technically snubbed the AOA.