the 000-28EC tends to have a darker warm tone, the OM-42 has a brighter articulate tone, imo. i love them both, the mod V neck doesn't work for me or i would own an EC. always preferred the low profile neck shape on the older OM-42s, not sure what yours will have(maybe the performer neck shape) as i think maybe they changed slightly-but i could be wrong on that.
these are going to be two "different" guitars that don't duplicate the other. i think you made a great choice. the whole 42 series rocks.
love the 42 in these Hillsong acoustic songs, Nigel is a monster player of anything guitar, that 42 really shines in his hands.
https://www.youtube.com/watch?v=xiYq7dAYrd0
https://www.youtube.com/watch?v=V9fTw9MLKAo