ERM?????
I think they are the same.
Tobi didn't use Kamui until he revealed his MS.
And when he revealed his MS he did say Kamui when he used it.
Obito's MS ability(one of them) is to phaze in and out of things and suck others in without activating his MS.
And don't say that Kakashi said they are one in the same because he didn't, He was talking about phazing and sucking others in.
Kamui is a long range jutsu.
Example:Kakashi and Deidara
Also, when Obito activated his MS and used his Kamui, you could see the swirl patterns in front of him a little ways out.
I believe they are different, but both S/T jutsu.
Obito's sharingan eyes abilities are centered upon S/T(obviously)
In saying that, It wouldn't need to be brought up because its not really that important.
Also getting off topic from what I said earlier,
Itachi's eyes are centered on genjutsu, (I think) Sasuke's eyes are centered on ninjutsu, and Obito's are centered on S/T. Is this just a unique ability or does every Uchiha who awaken their MS have some crazy random badass jutsu?