I have a small accumulation of J and K frame revolver plus a couple Ns that I am slowly accumulating S&W holsters for. I have been using the 1978 catalog that is posted on this sight for a reference. I have a number of #21 holsters and recently got a #19-24 which is not listed but appears to be a lined version of the #21 Blazer. Is the lining the only difference between the 19 and 21?