VAOS gives chains in both WD number and Renold Chain number.
For .375 x .225 x .25 chain with 26 links (presumably number of rollers) the WD number is 2905 and Renold 110036
For identical dimensioned chains, for each different length a different WD number. 47 links: WD 29412 etc.
See for more details the VAOS LV6-MTII dated February 1945 (book number Chilwell Publication No. 81/11).
Available as reprint at the better bookoutlet: ME!