The 19264 ones has difference in pin15 and pin16 used for CS, http://www.topwaydisplay.com/Pub/Manual/LM19264ABY-Manual-Rev0.1.pdf. It would be grateful if you could mod the library to handle the 00 state. Anyway, we should be cautious in stating the compatibility
The 192x64 pixel panel has three controller chips, the 128x64 panels has two.
Supporting more than two controller chips gets a little complicated. With just two controllers, the code just toggles between one and the other whenever the 64 bit boundary is crossed. With three or more chips, all the other chips need to be disabled. I think this is best done by adding a new method for controller chip selection. The method itself is not complicated (it would deselect all chips and select the chip with the x address modulo 64). But modifying the code to call this method in all the places needed requires some care. Feel free to produce a suitable version of the code if you want to ( I will be happy to give you advice) , but until code has been modified and tested, it would not be accurate to describe the 192 pixel panel as compatible so would respectfully ask you to modify that statement on the product pages with the 192 pixel panels
Let me know if I can be of help