Film Fest Wants ProRes

A project needs to be shipped to a Film Fest in Europe for screening. Producer told them the original edit master exists in DVCPROHD 720 23.98, which it does.

Fest will be projecting from a computer and requires to be sent:
"Quicktime ProRes in HD 1280x720 23.98p. A high-capacity SDHC card would be perfect."

I have much DVCPROHD experience but no ProRes.
Reading through posts, there seem to be 4 ways for conversion:

--timeline to Compressor to ProRes
--timeline export same settings QT self-contained, Compressor to ProRes
--timeline export reference QT, Compressor to ProRes
--copy DVCPROHD timeline elements to fresh ProRes timeline, export same settings self-contained

After whichever method, drag and drop to SDHC card.

Is there any honest-to-goodness quality difference between the above conversion methods?
The little 1280-wide show will be projected to a size many meters across, so I want to make my best effort!