Ah I didn't mean to imply types of work units like PPS-Sieve vs GFN on PrimeGrid, I guess the word I was looking for was batches. I think you're absolutely correct, and I'm going to update the article with that correction.
I do remember reading that article a while back, I guess 518 and 6141 in this article are examples of more GPU-optimised work units, whilst the 3148 is less so.
OK, I have 1st hand explanation for WU naming in the Amicable Project.
Example: amicable_10_20_20198_1519206302.310434_177
amicable_10_20 - app name
20198 - PID of the process that generated this WU
1519206302.310434 - timestamp
177 - number in the batch
Conclusion - It's only a coincidence than 518 WUs took much shorter time than 3148 WUs.
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