I think they would be considered different, but let me try to illustrate this.Aun ups to AuBun ups to BuAun≠BunAu=BuSo a player may use 6 each of Aun and Bun.A Player may not use more than 6 in any combination of the upped.
I thought you meant the following:Aun ups to AuBun ups to BuAun + Bun ups to CuAun≠BunAu≠Bu≠CuSo a player may use 6 each of Aun or Au, Bun or Bu, and Cu.
To find a mechanic that would require this configuration maybe difficult. I am just presenting a possibility. UTAlan's configuration is another option.