Hi,
I flashed my beaglebone black with Debian Jessie 8.3 too. The LCD 7'0 (4D System) works fine with the board. The LCD's manual mentions Angstrom but doesn't mention Debian distribution (section 3.2). For my experience, it's compatible with the beaglebone black.
For information:
$ uname -a
Linux beaglebone 4.1.18-ti-r53 #1 SMP Thu Mar 17 19:41:05 UTC 2016 armv7l GNU/Li nux
$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 8.3 (jessie)
Release: 8.3
Codename: jessie