I'm kind of clueless about this, what is the difference between the old one, therax's BRL mod with this one?

I try to read the description and the changelog but it doesn't that there's any difference at all? I see there are short description of "suitable of handling multiple ores", but what does this means exactly?

Thanks

Thanks for the tip. I will try to explain it better in the documentation. The problem is hard to see and only occurs under certain conditions. Probably you are not affected and can use the original version.

Special feature of this variant:

The loader uses invisible inserter to load the train. When the loading is finished, the inserter may not be able to unload all their items. They will then remain in the inserter until the next turn. If wagons of the next train now have filtered inventory that does not match the "leftovers" in the inserters, then the affected inserters cannot participate in loading. Loading will be slower, asymmetric or even completely prevented.
This mod reduces the problem almost completely by rotating the inserters 180° after leaving the train. This unloads the inserters into the loader if there is room. When the next train arrives, they are then rotated back again.
(That there is space in the loader immediately after loading is quite likely. However, there are also rare situations where the loader inventory is already full again. Then this solution fails unfortunately).

Why this solution is not contained in the original mod?
See here: https://github.com/mspielberg/factorio-railloader/pull/46

Oh very nice, another question/suggestion :
1. I noticed in the original mod, bulk loader inserter cant be set to filter mode, so if for example i have 100k things in the loader, i set order to load 20k, but my train capacity is 40k, my train loads up to 40k anyway because the added 2 seconds of inactivity rule from the finish loading option in the LTN. I know with this fix and turning off the "finish loading" option can solver this issue, but it just create more issue from non bulk loader inserter.
The best option would be enabling the bulk loader inserter to use filter mode, is this something that you could solve?

1. If I want to migrate from the old mod to this one, can I just switch the mod in my ongoing save with the old bulk loader already in the save, or do I need to delete all existing loader or replace all bulk loader after loading the save?

Thanks