Harley / Duckworth Chains

[wideglide38]

I have a H-D Rapido Chain (p/n 40004-73) and wanted to ask if anyone knew if the 40004-69P and the 40004-73 were the same chain (pitch, width and length)? I am not sure what Harley changed between those 4 years. I am looking for a Baldwin-Duckworth chain guide that I could purchase or download - any leads as to where I can find?
Thanks,
William
AMCA #10035