Well, yes and no. As stated on the list before, all PICs are "born" equal.
But the 10 and 20 MHz parts undergo tests at higher clock frequencies to
make _sure_ they will work at 10 or 20 MHz. Experience shows that even -04
parts will often work with high frequency clock, but it is not guarateed.
For one off project it is OK to use the cheaper parts at higher clock rate,
for mass production the little saving is probably not worth the service
hassle with not functioning or returned units. The same principle applies
for the low power and industrial temperature range.
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