True but the Remington Model 1861 Army .44 was almost identical except for the loading lever which had a cutout for pulling the cylinder pin out, and thus the cylinder itself, without lowering the loading lever. The U.S. Army ordered a number of these in 1861 and '62.
The New Model Army of 1863, or as we call it, the 1858 Model, replaced the cutout loading lever with the one we are familier with today to emliminate the shortcoming of the Model 1861 in which the pin would sometimes come loose allowing the cylinder to fall out while firing the weapon.
The New Model Army of 1863 later became the first big bore cartridge handgun adopted by the U.S. Army for use in the Indian wars when they were first converted by Remington to fire .46 cal cartridges in 1868.