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What is the difference between these chips, which is which?

These are all regular IC chips.

Note: When harvesting IC chips, it's best to do it to chips that are socketed to a slot on the board they are being harvested from, or if you can remove the chip from the board without hurting its overall value (which is very rare in most cases). Recently, I got my hands on a Tandy TRS-80 Model III computer. In opening up the computer, I was expecting to find a 8086 gold cap processor in the CPU socket, but instead found another type of CPU that looks more like a regular IC. I left all the socketed ICs on the board so I can get high telco grade for it as opposed to harvesting all the ICs and getting a lower grade for the board and a few ounces of ICs.

Most of the TRS-80 line use a Zolog Z80 or Z880. The III was exclusively 80A CPUs.
A few gold caps exist in the earliest production run of the original but by the time of that system they were commodity ICs.

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