The documentation for the 2.8" display on the Adafruit shows the pinout. You should be able to see what pins they may share and if that is an issue.
Snip:
"This design uses the hardware SPI pins (SCK, MOSI, MISO, CE0, CE1) as well as GPIO #25 and #24. All
other GPIO are unused. Since we had a tiny bit of space, there's 4 spots for optional slim tactile switches
wired to four GPIOs, that you can use if you want to make a basic user interface. For example, you can
use one as a power on/off button.
We bring out GPIO #23, #22, #21, and #18 to the four switch locations!
"