Seems like the SMD parts are a lot more accurate if you buy from Digikey etc. There is no marking on 0603, 0402 and smaller parts. You have to rely on their accuracy in manufacturing, the stake is too high. If there is any wrong part, it can cost a lot of money and the manufacturer will definitely complain and reputable distributors like Digikey will rectify the problem very very quick. Through hole resistors are really a thing of the past in the most part, quality control might be slipping. I never heard of SMD got it wrong from a few companies I worked for.