Yes I will post a comparison photo when we're done. The holes are just slightly different.
I just installed a set of the current Right-On brackets on my 2021 1500 Limited and they fit perfectly. No complaints whatsoever.
The part number of the OEM brackets is 68414475AC. This is the
exact same part number for model years 2019-2021 so I don't see why there would be any difference in the locations of the holes.
Note the part number and model year in each description below from
www.moparpartsarchbold.com/oem-parts/mopar-box-side-brace-68414475ac:
The existing OEM brackets are definitely not plastic as some may think, they are cast aluminum. RAM put some significant effort into designing and manufacturing these brackets. They are
extremely heavy-duty and were designed to withstand very, very heavy loads. They're massive at 2 1/4" x 1 1/4" x 10 1/2" on each end. I just don't see the need for such an extreme bracket unless perhaps if someone drove the truck with the MFT tailgate opened sideways for long distances. Even then, unless I'm missing something, the OEM brackets appear to be significant overkill.
While the Right-On brackets are very well-made and are solid steel compared to cast aluminum, they are probably not as strong overall as the OEM brackets primarily due to the cross brace which looks like it could withstand thousands of pounds and could not bend inwards or outwards because of the cross brace. That said, the Right-On brackets, even without a cross brace, look to be more than strong enough to easily support the extra weight of the MFT tailgate when opened sideways.
The need for such a massive OEM bracket is a mystery to me. It would take a structural engineer to explain it.