Process number questions

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Gus

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Older data book sometimes would have a picture of the process number die used for the different transistor numbers.

Current and/or past fets, bjts part numbers using the same process number
Do they use the same mask?
Are the same p number finished dies sorted for parameters and/or different cases and pinouts and then given the part number?

Do different companies that make the same part numbers use the same mask and processing for things like small signal fets?

I don't want to post why I am asking. I thought I might ask here first before trying to contact the companies
 
I don't know about same, but most likely similar.

There are some well publicized cases with popular old bipolar standards (like 2n3055) where sundry variants today don't resemble the original parts, but very likely process and mask changes.

JR
 
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