Its not a evo 6 engine its 2g 4g63t from earlier eclipse/evo I-III or RVR.
A evo 6 engine looks like this :

What your pic shows is the following engine which is not an evo 6 engine but earlier second generation 4g63t.

Kindly note the placement of gearbox and timing components are on the opposite side. Your engine shows the timing on right side of the engine and gearbox on the left side. Its a 2g 4g63t. Further more note the huge differences in the appearance of the valve cover itself. And no they cannot be swapped. 