[dynoman]

CNN has it as 746/538
http://www.cnn.com/election/

755/521
https://www.gop.com/official-2016-gop-delegate-count/

[CA Conservative]

CNN gave Trump 3 too many delegates from IL, and shorted Cruz 2 in MS, 3 in IL and 2 in ND. That accounts for the difference.

The last link you gave gives no breakout of the delegates by state, so there is no way to tell where they got those numbers, but they don't match up with any others.