Which to follow for Zenith parts

[TinCanAlley]

I've been meaning to ask this, but I always forget. But not this time.....

I've noticed in buying replacement parts for the Avante, sometimes the installed part isn't matching what was pasted on the inside of the set. I will post 2 pics of the paper and an example of the part difference.

In pic one, you see the paper and if you look at the video output transistors, they are listed as 121-866. So in trying to refresh parts and fix issues, I ordered some OEM ones and when they came it, they are completely different. I am not certain of the case numbering, but I believe the ones that arrived, and should have been in according to the paper, are TO-202 where the ones installed are TO-39. Also, the 24V power regulator is a 121-808, but the paper has it as 966.

Now everything is running as it should, so they seem okay. Why are they different? I understand difference in a SM, but to have different numbers in the set from the paper they put in it to aid in diagnostics and repairs.