Assuming it is all about link speed, it could easily be that one piece
of equipment is rated 10/100 Mbps, so 100 would be green (faster),
while the other end could be rated 10/100/1000, in which case green
could indicate 1000 Mbps. Connecting a cable between those two pieces
of equipment could give you a green light at one end and an orange
light at the other. Their respective documentation should explain it.
I said assuming it is all about link speed because on some of my gear
it is also partly about duplex, (I think, have not rechecked), but in
that case both ends should indicate the same.