Warehouse can be confusing on the naming and knowing what fabrics are being used but I just took a look at the most recent line sheet and it looks like the DD-1001 1947 uses the no.7 x no.7 13.5oz tri-state US cotton and the 1001XX(1000XX) 1947 uses 7.5 x 7.5 pink selvedge denim which sounds like it should be the DSB. I'm not sure if that was different previously though.