Yes, that's right. Barkcloth has become a catch all phrase that is often over used today. There were a variety of textured weaves in the late 30's through the late 50s. I have been collecting them for over 40 years and have seen many types.
Some were called pebble cloth, nubby weave cloth, or simply textured weave in the old fabric catalogs. Bark cloth or barkcloth (I see it both ways) has a particular texture that really does look and feel like tree bark. But many sellers today call all of the textured weaves barkcloth now, as it gets buyers attention.
The "barkcloth" gold enhanced upholstery fabrics did not make their appearance until the late 40s after WWII, and your pattern and weave looks more early 1950s than late 1940's. But as you say they have been there since before 1948, that is a mystery. Are you 100% positive they were not put there after 1948?
These were made in thousands of patterns over many years, and there is no 1 place to research every name or date of every pattern. Each manufacturer kept their own records. Your best bet is the old catalogs from Sears, Montgomery Wards, etc, which have pages of these fabrics with lots of good info for identifying them.
There were a few trade names for these gold enhanced upholstery fabrics, but I have my catalogs stashed away and cannot recall. The gold was painted/splattered/sprayed/ on after the fabric was printed. And yes, I agree to not wash it.
The fact that you have matching pairs is a real plus.
B