We have all had our own experiences with the caps mentioned.
Like several others, I have noticed no difference as both fit, both seem to fire the same, and I've personally never had a problem.
However, I had a chart once the gave "measured' sizes of all the caps available, and they are were all a bit different...as little as ten-thousandths, but still a wee bit different.....I do remember Remington being the largest on that chart.
(I thought I had posted that chart here, but I can't find it....not the one for nipple size, but the one for cap size.)
IMO, cap sizes have never really changed, while nipple sizes have varied just a little from manufacturer to manufacturer over the years. Of course that's just an observation and may have no validity.
I have always followed the rule that #10's were for pistol and #11's were for rifles...although I have fired #10's on a rifle, I never tried #11's on a pistol....don't know the reason for this, but I can't remember a single incident where I tried it.
And, like Snake eyes, even though a Top hat Musket cap is considered ten times hotter, other than cost I have never been astute enough to see any difference whatsoever.
My recommendation; if it works, if ya got 'em....then shoot 'em. But don't go buying 'em when #11's are available also.
Uncle Russ...