From the Codex Orks
FAQ:
Q: Does the Grots ability mean that units such as Mek Gunz and Killa Kans do not benefit from a Clan Kultur?
A: Yes – they do not benefit from a Clan Kultur. Furthermore, Ork Stratagems can only be used on these units if they explicitly state so (e.g. the Grot Shields Stratagem).
Anything else will work as long as they have the proper
<CLAN> and/or other required keywords