because I did ask them if they sent the correct sight based on the different numbers on the bases.
I suspect the numbers on the bases are referencing the height of the sight.
The 3/8" dovetail is a standard cut for a front sight on most rifles. I fit the front sight that came on my .357 BBB on a 1967 Winchester and it's original front blade on the Henry with no problems.
The dovetail on your barrel is probably a bit on the large side so unless they send you a front sight that is cut a bit large you will probably get the same results.
Its not unlikely that a barrel dovetail gets cut a little large occasionally. A dull cutter, equipment a bit out of sync or a barrel not set up correctly etc.