I'd say it's 'compatible enough', it just needs different parameters than what the PBP manual calls for.
From the quick read I did of that datasheet (the rest is up to you), it looks to me like the left 12 characters can be accessed normally, like it was a regular 12x4 display. But to get to the right 8 characters, you have to use that pin in some way.
It's either that or write your own routines to handle the display...
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