Yes, it’s true. In many cases Nissan and Infiniti vehicles use the same keyless entry systems. Consequently, the same remote transmitter will often work on a Nissan vehicle and an Infiniti vehicle. The keyfobs that were used on the most Nissan and Infiniti vehicles are the 3-button and 4-button remotes with FCC ID KBRASTU15. They cover a large number of vehicles starting with the 2001 or 2002 model years.
See Nissan and Infiniti remotes with FCC ID KBRASTU15 at this link.
The 4-button remote with the trunk icon is sold at most Advance Auto and Pep Boys stores as part number CPR-9504. It will replace both the 3-button keyfob and the 4-button remote with a liftgate button. The system in all vehicles using this remote can be programmed by the user. So, if you are buying a replacement remote for your Nissan or Infiniti car, truck or SUV, you can save a lot of money versus the dealership if you buy the remote at Advance Auto or Pep Boys and program it yourself.