I thought of that and wish now I had mentioned it in my writeup. There is no chance of a name collision in that example since the year, month and day are repeated in the new name. For example:
The new filenames for these two will be:
Having the sorting correct only matters among the filenames that start with the same YYYY?MDD dates. The HH_mm_ss format seems to be consistent and therefore sortable with the default sort. I'm assuming that from the limited example data we were given.