Bought a “reconditioned” set of rocker shaft\rockers.. One set has washers on ends only... second set has several washers (not all) between rockers and stands. Is this the way it is supposed to be?

Question 2: Some half the rockers are ECG 6564 B2 and half are 5751066. These appear identical except for the adjuster bolt. I don’t see this as a problem. Does anyone Disagree?

Thanks guys...