There's not a difference between a maritime cyclone and a surface cyclone. Maritime just refers to something over water; it makes no distinction between the type of storm. Surface versus upper level cyclone is the distinction and, in both cases, the "perfect" storm and the possible scenario to unfold here have support at all levels.

The scenario isn't that much unlike the "perfect" storm, but not what it has been hyped up to be in the 10-15 years after the fact. Cold-core system merges with a tropical/subtropical cyclone, acquiring a lower-level warm core while maintaining the cold core aloft and allowing for rapid deepening as somewhat of a hybrid extratropical system. It'd be foolish to say that such a scenario will happen, but it is within the realm of possibility. It just won't ever get the headlines the other one did.