Right off the bat, I'd say this is Ipswitch. Keep in mind that Ipswitch is a subspecies of Savannah Sparrow.
Lighter and chunkier/heavier than regular Savannah Sparrow. They tend to arrive earlier than the regular Savannah and head for their breeding grounds on Sable Island. We get to see them only during migration along the coastal areas of the Bay of Fundy.
You have 2 awesome images here, Susan!