Different battlefield, totally. Boston is compact, and the cordon was imposed quickly after the devices were planted. NYC/NJ is a big area, not amenable to cordon, and devices were set in diverse locations.
These is a raid going on in Elizabeth, NJ right now. As far as I can tell, this is being treated like a big deal. The Chelsea site is still closed to traffic as evidence continues to be gathered.
Looks like the corner at 100 Elmora Ave, Elizabeth, NJ. Use of bomb sniffing dogs reported.