Most of these were constructed to be used from atop a horse and/or camel and though they have ramrod channels and/or thimbles, a decorative 'sleeve,' typically, was formed over the barrel and forearm that did nothing more than 'simulate' these elements/features. The real ramrod would be stuck into a belt or sash.
These were trade items, not commissioned/presentation pieces. I'm sure that they were constructed along basic patterns and may even have used a selection of fittings/furniture, deliberately designed for that particular market.
But, if there is one thing that you can probably count on, amongst this type of firearm, it is 'variation.' The Industrial Revolution, in firearms manufacture, was still a few years off.
They are probably lucky just to have made it this far without being totally destroyed and/or sold for scrap. Throw some Howard's Feed-n-Wax (close counts) on them and just enjoy them, as you found them.
Good luck!