Unfortunately all generic DVB-T dongles have same Serial Number: 00000001. Flightaware's all ProStick dvb-t dongles have Serial Number: 00001000.
I faced similar problem when I installed dump1090 (ads-b) and dump978 (uat) on my RPi, with two DVB-T dongles plugged-in, one connected to 978 Mhz antenna, other to 1090 Mhz antenna. These two dumps will randomly grab the dongles at start. Although dump1090 and dump978 both had provision to specify the device number (actually usb port number) as 0, 1, 2, .... and I did specify device 0 for dump1090, and device 1 for dump978, the grab was sometimes still random.