OH! Now I see what you mean.
I thought your question was "if my PMI-ACP application will be audited, will my original PMP application (from when I took the PMP) be re-audited as well?"
But what you are really asking is this: "To apply for the PMI-ACP Exam you have to show that you have 2,000 hours of general project management experience. This is not necessary if you are already PMP certified. So if your PMI-ACP application gets audited, do they somehow include the PMP in this audit?".
The answer is: No they don't.
On page 6 of the PMI-ACP Handbook, we see the following: "For those who hold a PMP and/or PgMP certifications, PMI has already verified you have exceeded the project experience requirements. In other words, PMP and/or PgMP certification holders will be accepted as fulfilling the general project experience requirements."
So what PMI will do is to check their records to make sure that you are truly PMP certified. But nothing beyond that.