No, but people who are also in NG+ at the early bosses likely will. Your matchmaking is something like SL +/- 10%. So for you, you're at SL 120, 10% of that is 12, so people between SL 108 and 132 should be able to see your sign and summon you. Your WL also matters, but by NG+ everyones weapon should be maxed so that wont really affect you. Also, whichever NG you are on doesnt restrict you for matchmaking. You could be still at NG1 and pput your sign by Vordt, and people who are in NG+ could summon you.