The 80x160 LCD has the same internal buffer as the 128x160 (same ST7735 controller), but the display is offset. In my bb_spi_lcd library I have different settings for the 128x160, and 80x160 displays and the difference is a x,y offset of the upper left pixel. The 80x160 displays that I've tested start the visible display at x=26, y=1 or x=24, y=0 (depends on the display).