cornixt:
Yep, that was true, not sure if it still is since it was from before Orks were fungus. 40k still remains separate from Warhammer for the time being though.
Vexxus:
For the sake of being thorough I just thought that I would mention that Big’Uns are missing from the list. I realize that they are technically the same race, but they can definitely be represented differently, both as separate and distinct units as well as artistically.
So Big’Uns? you decide 
Kera foehunter:
well i think big,um are big orc but i still like them and the savage orcs
Thommy H:
Heard a rumor that squigs are experiments by tyranids on ork genes. One day orks boarded a ship and found the squigs because they looked "orky". Is there any truth to that?There used to be. It think it was just an explanation for how squigs came about and, for a while, Tyranids and Orks both had them as a unit. Since then, the Tyranid squigs have become ripper swarms, and squigs became part of the Ork family as a self-perpetuating fungal ecosystem that appears spontaneously around Orks.
Filipicusius
There's no way you can reconcile it with current background anyway - Tyranids didn't arrive in the galaxy until the late 41st Millennium, and Orks have always had squigs. You could say they were maybe some sort of precursor experiment (like Genestealers, the Catachan Devil et al) but there's not really any need. It's just old fluff like Blood Angels being a strict Codex Chapter and Imperial Guard using beastmen platoons.
Hashut’s Blessing:
Ah, the problems with everchanging fluff 
vexxus: I’d say it depends upon how we’re grouping evry type of O&G. If it’s by unit types, yes, if not, they’d be orcs, as savage orcs would be.
cornixt, they are separate (except apparently the Warp/Realm of Chaos) “universes”, but can you see the similarities (I think this is more what I was meaning, but never stating) that are arriving?
I know it’s not canonical, but according to WH Online: WAR, they are a fungus as well