Yes, the Leafs also had this in 2016/17 when both units played almost the exact same.
I am not really a fan of this. To me you have to keep Rielly with Marner. There was a good Athletic article a year and a half ago or so showing why LHD Rielly and RHW Marner worked so well together, with pass after pass from Rielly that wouldn't have worked if he was RH.
On the other hand, putting Matthews and Nylander on their off-wings has failed in the past. People want the one-timer from Matthews, but he doesn't need it. He can play on the left side, get the puck and fire it amazingly fast and accurate. Putting Barrie on this unit would allow both RHW and RHD Nylander and Barrie to give a double royal road pass threat - Barrie is one of the few D I have seen who can do that well, and I don't think that has been a D in the league who makes high danger shot assists at a frequency higher than Barrie over the last 4 or 5 years. This would allow the Leafs to set up the same kind of PP as teams like Washington and Colorado have done - with Matthews the shooter in the same location as Ovi and MacKinnon and two passers (Barrie and Nylander) and while, unlike MacKinnon and Ovi, Matthews wouldn't be one-timing it because Matthews is a left shot (while Mac and Ovi are right), Matthews can still get the shot off really quick - and - he can disguise the shot - which the one-timers can't.