Not sure what you mean. Unless something changed Erj side still gets the DC plan so up to 6% pay deposited in retirement account (which was being taken away in the JCBA) plus the match which is up to another 6% in your 401k ... or up to 12% in total.

As regards Smartpref vs Flightline, neither side want to make concessions, just write rules for both and put it in a Jcba - if you bid over from Crj to Erj just know you'll be using smartPref and vice versa