If the store owner mapped 001- as consecutive entries instead of in accordance with the product_id (or if mistyped when entering it by product_id) then the possibility of duplication may exist and then, well all sorts of unexpected things start happening if the duplication was not planned.
Yes, it was consecutive entries on the spreadsheet (nothing to do with product_id).

I already ran it with both 001, and 002, didn't see anything unusual the only odd thing that on products all display if i sorted by model number for example 001-101, then 001-1001, 001-1019, 001-102, 001-1020... that kind of sorting, but it will do the same in both scenarios.

I will use 002 just to be safe.